diff --git a/Cargo.lock b/Cargo.lock
index 2ae16ade3..6e73b4be8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -409,7 +409,7 @@ dependencies = [
  "send_wrapper",
  "serde",
  "serde_json",
- "serde_yaml_ng",
+ "serde_norway",
  "serial_test",
  "sha1",
  "sha2 0.11.0",
@@ -5099,25 +5099,25 @@ dependencies = [
 ]
 
 [[package]]
-name = "serde_spanned"
-version = "1.1.1"
+name = "serde_norway"
+version = "0.9.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6662b5879511e06e8999a8a235d848113e942c9124f211511b16466ee2995f26"
+checksum = "e408f29489b5fd500fab51ff1484fc859bb655f32c671f307dcd733b72e8168c"
 dependencies = [
- "serde_core",
+ "indexmap",
+ "itoa",
+ "ryu",
+ "serde",
+ "unsafe-libyaml-norway",
 ]
 
 [[package]]
-name = "serde_yaml_ng"
-version = "0.10.0"
+name = "serde_spanned"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b4db627b98b36d4203a7b458cf3573730f2bb591b28871d916dfa9efabfd41f"
+checksum = "6662b5879511e06e8999a8a235d848113e942c9124f211511b16466ee2995f26"
 dependencies = [
- "indexmap",
- "itoa",
- "ryu",
- "serde",
- "unsafe-libyaml",
+ "serde_core",
 ]
 
 [[package]]
@@ -6184,10 +6184,10 @@ dependencies = [
 ]
 
 [[package]]
-name = "unsafe-libyaml"
-version = "0.2.11"
+name = "unsafe-libyaml-norway"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
+checksum = "b39abd59bf32521c7f2301b52d05a6a2c975b6003521cbd0c6dc1582f0a22104"
 
 [[package]]
 name = "untrusted"
diff --git a/Cargo.toml b/Cargo.toml
index 554f99397..8f1a9a349 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,7 +42,8 @@ anyhow = "1"
 # Serialization
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
-serde_yaml_ng = "0.10"
+# Maintained serde/libyaml fork; avoid the archived unsafe-libyaml dependency.
+serde_norway = "0.9.42"
 
 # JSON processing (jq) - verified embeddable
 jaq-core = "3.1.1"
diff --git a/crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.json b/crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.json
new file mode 100644
index 000000000..ff577c519
--- /dev/null
+++ b/crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.json
@@ -0,0 +1,4842 @@
+{
+  "moniker": "mykhailosmin-macos-aarch64",
+  "timestamp": "1791857690",
+  "system": {
+    "hostname": "Mykhailos-Mini.lan",
+    "os": "macos",
+    "arch": "aarch64",
+    "cpus": 12,
+    "moniker": "mykhailosmin-macos-aarch64"
+  },
+  "iterations": 10,
+  "warmup": 2,
+  "prewarm_cases": 3,
+  "runners": [
+    "bashkit",
+    "bash"
+  ],
+  "runner_versions": {
+    "bash": "/opt/homebrew/bin/bash (GNU Bash 5.3.20(1)-release)"
+  },
+  "results": [
+    {
+      "runner": "bashkit",
+      "case_name": "startup_empty",
+      "category": "startup",
+      "iterations": 10,
+      "times_ns": [
+        38250,
+        32125,
+        30791,
+        30000,
+        29541,
+        29542,
+        29292,
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+        29167,
+        32208
+      ],
+      "mean_ns": 30983.2,
+      "stddev_ns": 2668.387183300055,
+      "min_ns": 28916,
+      "max_ns": 38250,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bash",
+      "case_name": "startup_empty",
+      "category": "startup",
+      "iterations": 10,
+      "times_ns": [
+        19017084,
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+      "stddev_ns": 5328490.976384009,
+      "min_ns": 6802583,
+      "max_ns": 20188833,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bashkit",
+      "case_name": "startup_true",
+      "category": "startup",
+      "iterations": 10,
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+      "output_match": true
+    },
+    {
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+      "category": "startup",
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+    },
+    {
+      "runner": "bash",
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+      "category": "startup",
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+    },
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+    {
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+    {
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+      "times_ns": [
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+      "runner": "bashkit",
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+    {
+      "runner": "bash",
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+      "times_ns": [
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+      "output_match": true
+    },
+    {
+      "runner": "bashkit",
+      "case_name": "io_redirect_write",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
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+        53708,
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+      "mean_ns": 51654.2,
+      "stddev_ns": 2361.4952805373123,
+      "min_ns": 49708,
+      "max_ns": 57750,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bash",
+      "case_name": "io_redirect_write",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
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+      "mean_ns": 10176687.5,
+      "stddev_ns": 554630.0144022589,
+      "min_ns": 9428708,
+      "max_ns": 11114542,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bashkit",
+      "case_name": "io_append",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        75708,
+        69209,
+        67292,
+        66875,
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+        64291
+      ],
+      "mean_ns": 66733.3,
+      "stddev_ns": 3353.1596457669593,
+      "min_ns": 64291,
+      "max_ns": 75708,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bash",
+      "case_name": "io_append",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        9669333,
+        9468792,
+        8958417,
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+        14235875,
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+      "mean_ns": 10589662.6,
+      "stddev_ns": 1574662.9389726042,
+      "min_ns": 8958417,
+      "max_ns": 14235875,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bashkit",
+      "case_name": "io_dev_null",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        38292,
+        35625,
+        33542,
+        33334,
+        33625,
+        33166,
+        32667,
+        33000,
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+      "mean_ns": 33904.3,
+      "stddev_ns": 1663.586730531354,
+      "min_ns": 32667,
+      "max_ns": 38292,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bash",
+      "case_name": "io_dev_null",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        5967500,
+        5542416,
+        5111084,
+        5489583,
+        5503042,
+        5175500,
+        5499083,
+        5351792,
+        5485333,
+        5644041
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+      "mean_ns": 5476937.4,
+      "stddev_ns": 226856.692054786,
+      "min_ns": 5111084,
+      "max_ns": 5967500,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bashkit",
+      "case_name": "io_stderr_redirect",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        39000,
+        36041,
+        34792,
+        34709,
+        34250,
+        33958,
+        33791,
+        33667,
+        33625,
+        33709
+      ],
+      "mean_ns": 34754.2,
+      "stddev_ns": 1582.7693957112008,
+      "min_ns": 33625,
+      "max_ns": 39000,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bash",
+      "case_name": "io_stderr_redirect",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        5347125,
+        5490125,
+        4967916,
+        5185583,
+        5149333,
+        5099584,
+        4892250,
+        5218666,
+        4834750,
+        5251000
+      ],
+      "mean_ns": 5143633.2,
+      "stddev_ns": 192830.1105309023,
+      "min_ns": 4834750,
+      "max_ns": 5490125,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bashkit",
+      "case_name": "io_read_lines",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        67750,
+        63500,
+        62500,
+        62750,
+        60666,
+        61417,
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+        59542,
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+      ],
+      "mean_ns": 61945.8,
+      "stddev_ns": 2277.3949503764165,
+      "min_ns": 59542,
+      "max_ns": 67750,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bash",
+      "case_name": "io_read_lines",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        4786042,
+        5169458,
+        4948041,
+        5505791,
+        5116917,
+        4713542,
+        4912666,
+        4688875,
+        4924584,
+        5010750
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+      "mean_ns": 4977666.6,
+      "stddev_ns": 231081.67489534948,
+      "min_ns": 4688875,
+      "max_ns": 5505791,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bashkit",
+      "case_name": "io_multiline_heredoc",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        47459,
+        43125,
+        44375,
+        42708,
+        40958,
+        40167,
+        40958,
+        41458,
+        128375,
+        61833
+      ],
+      "mean_ns": 53141.6,
+      "stddev_ns": 25798.58403943906,
+      "min_ns": 40167,
+      "max_ns": 128375,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    },
+    {
+      "runner": "bash",
+      "case_name": "io_multiline_heredoc",
+      "category": "io",
+      "iterations": 10,
+      "times_ns": [
+        7205750,
+        7490917,
+        7715167,
+        8659375,
+        8299750,
+        7891542,
+        8595875,
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+        9018084,
+        8539584
+      ],
+      "mean_ns": 8129079.4,
+      "stddev_ns": 551298.7011920488,
+      "min_ns": 7205750,
+      "max_ns": 9018084,
+      "errors": 0,
+      "error_messages": [],
+      "output_match": true
+    }
+  ],
+  "summary": {
+    "total_cases": 96,
+    "runner_stats": {
+      "bashkit": {
+        "total_time_ms": 27.9108833,
+        "avg_time_ms": 0.29073836770833333,
+        "error_count": 0,
+        "error_rate": 0.0,
+        "output_match_rate": 1.0
+      },
+      "bash": {
+        "total_time_ms": 1622.9294230000005,
+        "avg_time_ms": 16.905514822916672,
+        "error_count": 0,
+        "error_rate": 0.0,
+        "output_match_rate": 1.0
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.md b/crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.md
new file mode 100644
index 000000000..17e9e3161
--- /dev/null
+++ b/crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.md
@@ -0,0 +1,308 @@
+# Bashkit Benchmark Report
+
+## System Information
+
+- **Moniker**: `mykhailosmin-macos-aarch64`
+- **Hostname**: Mykhailos-Mini.lan
+- **OS**: macos
+- **Architecture**: aarch64
+- **CPUs**: 12
+- **Timestamp**: 1791857690
+- **Iterations**: 10
+- **Warmup**: 2
+- **Prewarm cases**: 3
+
+- **bash executable**: `/opt/homebrew/bin/bash (GNU Bash 5.3.20(1)-release)`
+
+## Summary
+
+Benchmarked 96 cases across 2 runners.
+
+| Runner | Total Time (ms) | Avg/Case (ms) | Errors | Error Rate | Output Match |
+|--------|-----------------|---------------|--------|------------|-------------|
+| bashkit | 27.91 | 0.291 | 0 | 0.0% | 100.0% |
+| bash | 1622.93 | 16.906 | 0 | 0.0% | 100.0% |
+
+## Performance Comparison
+
+**Bashkit is 58.1x faster** than bash on average.
+
+## Results by Category
+
+### Arithmetic
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| arith_basic | bashkit | 0.032 | ±0.002 | - | ✓ |
+| arith_basic | bash | 6.327 | ±0.723 | - | ✓ |
+| arith_complex | bashkit | 0.033 | ±0.002 | - | ✓ |
+| arith_complex | bash | 6.184 | ±0.871 | - | ✓ |
+| arith_variables | bashkit | 0.036 | ±0.002 | - | ✓ |
+| arith_variables | bash | 6.004 | ±0.572 | - | ✓ |
+| arith_increment | bashkit | 0.035 | ±0.002 | - | ✓ |
+| arith_increment | bash | 6.413 | ±0.537 | - | ✓ |
+| arith_modulo | bashkit | 0.032 | ±0.002 | - | ✓ |
+| arith_modulo | bash | 6.160 | ±0.473 | - | ✓ |
+| arith_loop_sum | bashkit | 0.058 | ±0.007 | - | ✓ |
+| arith_loop_sum | bash | 5.670 | ±0.245 | - | ✓ |
+
+### Arrays
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| arr_create | bashkit | 0.045 | ±0.021 | - | ✓ |
+| arr_create | bash | 8.206 | ±1.589 | - | ✓ |
+| arr_all | bashkit | 0.074 | ±0.052 | - | ✓ |
+| arr_all | bash | 7.751 | ±1.710 | - | ✓ |
+| arr_length | bashkit | 0.069 | ±0.052 | - | ✓ |
+| arr_length | bash | 25.467 | ±10.507 | - | ✓ |
+| arr_iterate | bashkit | 0.094 | ±0.080 | - | ✓ |
+| arr_iterate | bash | 6.504 | ±0.578 | - | ✓ |
+| arr_slice | bashkit | 0.038 | ±0.002 | - | ✓ |
+| arr_slice | bash | 6.340 | ±0.973 | - | ✓ |
+| arr_assign_index | bashkit | 0.045 | ±0.020 | - | ✓ |
+| arr_assign_index | bash | 5.302 | ±0.346 | - | ✓ |
+
+### Complex
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| complex_fibonacci | bashkit | 3.086 | ±0.070 | - | ✓ |
+| complex_fibonacci | bash | 119.871 | ±8.967 | - | ✓ |
+| complex_fibonacci_iter | bashkit | 0.090 | ±0.029 | - | ✓ |
+| complex_fibonacci_iter | bash | 5.968 | ±0.551 | - | ✓ |
+| complex_nested_subst | bashkit | 0.046 | ±0.001 | - | ✓ |
+| complex_nested_subst | bash | 9.161 | ±1.864 | - | ✓ |
+| complex_loop_compute | bashkit | 0.111 | ±0.077 | - | ✓ |
+| complex_loop_compute | bash | 6.914 | ±0.895 | - | ✓ |
+| complex_string_build | bashkit | 0.052 | ±0.020 | - | ✓ |
+| complex_string_build | bash | 5.928 | ±0.737 | - | ✓ |
+| complex_json_transform | bashkit | 0.342 | ±0.024 | - | ✓ |
+| complex_json_transform | bash | 8.847 | ±0.214 | - | ✓ |
+| complex_pipeline_text | bashkit | 0.087 | ±0.037 | - | ✓ |
+| complex_pipeline_text | bash | 8.652 | ±0.730 | - | ✓ |
+
+### Control
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| ctrl_if_simple | bashkit | 0.034 | ±0.002 | - | ✓ |
+| ctrl_if_simple | bash | 5.804 | ±0.498 | - | ✓ |
+| ctrl_if_else | bashkit | 0.035 | ±0.002 | - | ✓ |
+| ctrl_if_else | bash | 5.130 | ±0.170 | - | ✓ |
+| ctrl_for_list | bashkit | 0.047 | ±0.002 | - | ✓ |
+| ctrl_for_list | bash | 6.058 | ±1.573 | - | ✓ |
+| ctrl_for_range | bashkit | 0.060 | ±0.017 | - | ✓ |
+| ctrl_for_range | bash | 11.672 | ±3.921 | - | ✓ |
+| ctrl_while | bashkit | 0.073 | ±0.003 | - | ✓ |
+| ctrl_while | bash | 10.071 | ±1.427 | - | ✓ |
+| ctrl_case | bashkit | 0.037 | ±0.002 | - | ✓ |
+| ctrl_case | bash | 12.834 | ±3.884 | - | ✓ |
+| ctrl_function | bashkit | 0.038 | ±0.002 | - | ✓ |
+| ctrl_function | bash | 9.903 | ±2.201 | - | ✓ |
+| ctrl_function_return | bashkit | 0.132 | ±0.022 | - | ✓ |
+| ctrl_function_return | bash | 9.656 | ±2.174 | - | ✓ |
+| ctrl_nested_loops | bashkit | 0.062 | ±0.003 | - | ✓ |
+| ctrl_nested_loops | bash | 10.697 | ±2.211 | - | ✓ |
+
+### Io
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| io_redirect_write | bashkit | 0.052 | ±0.002 | - | ✓ |
+| io_redirect_write | bash | 10.177 | ±0.555 | - | ✓ |
+| io_append | bashkit | 0.067 | ±0.003 | - | ✓ |
+| io_append | bash | 10.590 | ±1.575 | - | ✓ |
+| io_dev_null | bashkit | 0.034 | ±0.002 | - | ✓ |
+| io_dev_null | bash | 5.477 | ±0.227 | - | ✓ |
+| io_stderr_redirect | bashkit | 0.035 | ±0.002 | - | ✓ |
+| io_stderr_redirect | bash | 5.144 | ±0.193 | - | ✓ |
+| io_read_lines | bashkit | 0.062 | ±0.002 | - | ✓ |
+| io_read_lines | bash | 4.978 | ±0.231 | - | ✓ |
+| io_multiline_heredoc | bashkit | 0.053 | ±0.026 | - | ✓ |
+| io_multiline_heredoc | bash | 8.129 | ±0.551 | - | ✓ |
+
+### Large
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| large_loop_1000 | bashkit | 2.298 | ±0.149 | - | ✓ |
+| large_loop_1000 | bash | 7.415 | ±0.399 | - | ✓ |
+| large_string_append_100 | bashkit | 0.220 | ±0.003 | - | ✓ |
+| large_string_append_100 | bash | 6.272 | ±0.371 | - | ✓ |
+| large_array_fill_200 | bashkit | 1.091 | ±0.252 | - | ✓ |
+| large_array_fill_200 | bash | 9.059 | ±1.692 | - | ✓ |
+| large_nested_loops | bashkit | 1.182 | ±0.050 | - | ✓ |
+| large_nested_loops | bash | 6.600 | ±0.597 | - | ✓ |
+| large_fibonacci_12 | bashkit | 8.406 | ±0.320 | - | ✓ |
+| large_fibonacci_12 | bash | 335.532 | ±98.232 | - | ✓ |
+| large_function_calls_500 | bashkit | 4.520 | ±0.083 | - | ✓ |
+| large_function_calls_500 | bash | 418.632 | ±74.558 | - | ✓ |
+| large_multiline_script | bashkit | 0.247 | ±0.021 | - | ✓ |
+| large_multiline_script | bash | 5.720 | ±0.197 | - | ✓ |
+| large_pipeline_chain | bashkit | 0.517 | ±0.025 | - | ✓ |
+| large_pipeline_chain | bash | 8.552 | ±0.297 | - | ✓ |
+| large_assoc_array | bashkit | 0.041 | ±0.002 | - | ✓ |
+| large_assoc_array | bash | 5.554 | ±0.325 | - | ✓ |
+
+### Pipes
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| pipe_simple | bashkit | 0.052 | ±0.012 | - | ✓ |
+| pipe_simple | bash | 9.048 | ±0.512 | - | ✓ |
+| pipe_multi | bashkit | 0.067 | ±0.002 | - | ✓ |
+| pipe_multi | bash | 9.182 | ±0.604 | - | ✓ |
+| pipe_command_subst | bashkit | 0.039 | ±0.002 | - | ✓ |
+| pipe_command_subst | bash | 5.819 | ±0.304 | - | ✓ |
+| pipe_heredoc | bashkit | 0.036 | ±0.002 | - | ✓ |
+| pipe_heredoc | bash | 8.237 | ±0.811 | - | ✓ |
+| pipe_herestring | bashkit | 0.043 | ±0.017 | - | ✓ |
+| pipe_herestring | bash | 7.509 | ±0.242 | - | ✓ |
+| pipe_discard | bashkit | 0.037 | ±0.002 | - | ✓ |
+| pipe_discard | bash | 6.576 | ±0.610 | - | ✓ |
+
+### Startup
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| startup_empty | bashkit | 0.031 | ±0.003 | - | ✓ |
+| startup_empty | bash | 12.948 | ±5.328 | - | ✓ |
+| startup_true | bashkit | 0.031 | ±0.002 | - | ✓ |
+| startup_true | bash | 7.234 | ±0.936 | - | ✓ |
+| startup_echo | bashkit | 0.033 | ±0.002 | - | ✓ |
+| startup_echo | bash | 8.206 | ±1.302 | - | ✓ |
+| startup_exit | bashkit | 0.031 | ±0.002 | - | ✓ |
+| startup_exit | bash | 5.560 | ±0.150 | - | ✓ |
+
+### Strings
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| str_concat | bashkit | 0.080 | ±0.070 | - | ✓ |
+| str_concat | bash | 8.382 | ±1.347 | - | ✓ |
+| str_printf | bashkit | 0.033 | ±0.002 | - | ✓ |
+| str_printf | bash | 7.858 | ±1.358 | - | ✓ |
+| str_printf_pad | bashkit | 0.044 | ±0.032 | - | ✓ |
+| str_printf_pad | bash | 8.758 | ±3.044 | - | ✓ |
+| str_echo_escape | bashkit | 0.032 | ±0.002 | - | ✓ |
+| str_echo_escape | bash | 7.371 | ±1.451 | - | ✓ |
+| str_prefix_strip | bashkit | 0.091 | ±0.030 | - | ✓ |
+| str_prefix_strip | bash | 9.506 | ±1.496 | - | ✓ |
+| str_suffix_strip | bashkit | 0.056 | ±0.038 | - | ✓ |
+| str_suffix_strip | bash | 10.919 | ±8.362 | - | ✓ |
+| str_uppercase | bashkit | 0.033 | ±0.002 | - | ✓ |
+| str_uppercase | bash | 5.910 | ±1.032 | - | ✓ |
+| str_lowercase | bashkit | 0.034 | ±0.002 | - | ✓ |
+| str_lowercase | bash | 5.300 | ±0.229 | - | ✓ |
+
+### Subshell
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| subshell_simple | bashkit | 0.034 | ±0.002 | - | ✓ |
+| subshell_simple | bash | 6.374 | ±0.228 | - | ✓ |
+| subshell_isolation | bashkit | 0.046 | ±0.010 | - | ✓ |
+| subshell_isolation | bash | 8.655 | ±3.567 | - | ✓ |
+| subshell_nested | bashkit | 0.051 | ±0.002 | - | ✓ |
+| subshell_nested | bash | 8.987 | ±1.896 | - | ✓ |
+| subshell_pipeline | bashkit | 0.044 | ±0.003 | - | ✓ |
+| subshell_pipeline | bash | 8.220 | ±0.259 | - | ✓ |
+| subshell_capture_loop | bashkit | 0.070 | ±0.003 | - | ✓ |
+| subshell_capture_loop | bash | 9.856 | ±0.409 | - | ✓ |
+| subshell_process_subst | bashkit | 0.050 | ±0.002 | - | ✓ |
+| subshell_process_subst | bash | 7.768 | ±0.339 | - | ✓ |
+
+### Tools
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| tool_grep_simple | bashkit | 0.046 | ±0.006 | - | ✓ |
+| tool_grep_simple | bash | 9.305 | ±2.407 | - | ✓ |
+| tool_grep_case | bashkit | 0.076 | ±0.004 | - | ✓ |
+| tool_grep_case | bash | 13.231 | ±3.476 | - | ✓ |
+| tool_grep_count | bashkit | 0.044 | ±0.003 | - | ✓ |
+| tool_grep_count | bash | 8.754 | ±0.401 | - | ✓ |
+| tool_grep_invert | bashkit | 0.045 | ±0.005 | - | ✓ |
+| tool_grep_invert | bash | 8.354 | ±0.473 | - | ✓ |
+| tool_grep_regex | bashkit | 0.057 | ±0.010 | - | ✓ |
+| tool_grep_regex | bash | 8.983 | ±0.877 | - | ✓ |
+| tool_sed_replace | bashkit | 0.051 | ±0.025 | - | ✓ |
+| tool_sed_replace | bash | 8.927 | ±1.188 | - | ✓ |
+| tool_sed_global | bashkit | 0.073 | ±0.038 | - | ✓ |
+| tool_sed_global | bash | 8.640 | ±0.516 | - | ✓ |
+| tool_sed_delete | bashkit | 0.045 | ±0.013 | - | ✓ |
+| tool_sed_delete | bash | 9.103 | ±0.898 | - | ✓ |
+| tool_sed_lines | bashkit | 0.039 | ±0.002 | - | ✓ |
+| tool_sed_lines | bash | 8.473 | ±0.288 | - | ✓ |
+| tool_sed_backrefs | bashkit | 0.050 | ±0.003 | - | ✓ |
+| tool_sed_backrefs | bash | 10.082 | ±3.908 | - | ✓ |
+| tool_awk_print | bashkit | 0.055 | ±0.034 | - | ✓ |
+| tool_awk_print | bash | 10.103 | ±2.355 | - | ✓ |
+| tool_awk_sum | bashkit | 0.046 | ±0.007 | - | ✓ |
+| tool_awk_sum | bash | 8.165 | ±0.273 | - | ✓ |
+| tool_awk_pattern | bashkit | 0.066 | ±0.021 | - | ✓ |
+| tool_awk_pattern | bash | 8.144 | ±0.372 | - | ✓ |
+| tool_awk_fieldsep | bashkit | 0.044 | ±0.005 | - | ✓ |
+| tool_awk_fieldsep | bash | 8.267 | ±0.233 | - | ✓ |
+| tool_awk_nf | bashkit | 0.042 | ±0.002 | - | ✓ |
+| tool_awk_nf | bash | 8.563 | ±0.529 | - | ✓ |
+| tool_awk_compute | bashkit | 0.057 | ±0.023 | - | ✓ |
+| tool_awk_compute | bash | 8.220 | ±0.290 | - | ✓ |
+| tool_jq_identity | bashkit | 0.397 | ±0.069 | - | ✓ |
+| tool_jq_identity | bash | 8.762 | ±0.363 | - | ✓ |
+| tool_jq_field | bashkit | 0.405 | ±0.058 | - | ✓ |
+| tool_jq_field | bash | 8.411 | ±0.192 | - | ✓ |
+| tool_jq_array | bashkit | 0.372 | ±0.062 | - | ✓ |
+| tool_jq_array | bash | 8.487 | ±0.266 | - | ✓ |
+| tool_jq_filter | bashkit | 0.345 | ±0.019 | - | ✓ |
+| tool_jq_filter | bash | 8.689 | ±0.316 | - | ✓ |
+| tool_jq_map | bashkit | 0.425 | ±0.068 | - | ✓ |
+| tool_jq_map | bash | 9.266 | ±0.988 | - | ✓ |
+
+### Variables
+
+| Benchmark | Runner | Mean (ms) | StdDev | Errors | Match |
+|-----------|--------|-----------|--------|--------|-------|
+| var_assign_simple | bashkit | 0.035 | ±0.003 | - | ✓ |
+| var_assign_simple | bash | 5.827 | ±0.223 | - | ✓ |
+| var_assign_many | bashkit | 0.046 | ±0.002 | - | ✓ |
+| var_assign_many | bash | 5.678 | ±0.330 | - | ✓ |
+| var_default | bashkit | 0.032 | ±0.002 | - | ✓ |
+| var_default | bash | 6.069 | ±0.520 | - | ✓ |
+| var_length | bashkit | 0.036 | ±0.005 | - | ✓ |
+| var_length | bash | 6.257 | ±0.515 | - | ✓ |
+| var_substring | bashkit | 0.034 | ±0.003 | - | ✓ |
+| var_substring | bash | 5.352 | ±0.164 | - | ✓ |
+| var_replace | bashkit | 0.036 | ±0.003 | - | ✓ |
+| var_replace | bash | 5.557 | ±0.471 | - | ✓ |
+| var_nested | bashkit | 0.035 | ±0.003 | - | ✓ |
+| var_nested | bash | 6.430 | ±0.851 | - | ✓ |
+| var_export | bashkit | 0.035 | ±0.002 | - | ✓ |
+| var_export | bash | 7.326 | ±1.489 | - | ✓ |
+
+## Runner Descriptions
+
+| Runner | Type | Description |
+|--------|------|-------------|
+| bashkit | in-process | Rust library call, no fork/exec |
+| bashkit-cli | subprocess | bashkit binary, new process per run |
+| bashkit-js | persistent child | Node.js + @everruns/bashkit, warm interpreter |
+| bashkit-py | persistent child | Python + bashkit package, warm interpreter |
+| bash | subprocess | PATH-selected Bash >=4, new process per run |
+| gbash | subprocess | gbash binary (Go), new process per run |
+| gbash-server | persistent child | gbash JSON-RPC server, warm interpreter |
+| just-bash | subprocess | just-bash CLI, new process per run |
+| just-bash-inproc | persistent child | Node.js + just-bash library, warm interpreter |
+
+## Assumptions & Notes
+
+- Times measured in nanoseconds, displayed in milliseconds
+- Prewarm phase runs first few cases to warm up JIT/compilation
+- Per-benchmark warmup iterations excluded from timing
+- Output match compares against bash output when available
+- Errors include execution failures and exit code mismatches
+- In-process: interpreter runs inside the benchmark process
+- Subprocess: new process spawned per benchmark run
+- Persistent child: long-lived child process, amortizes startup cost
+
diff --git a/crates/bashkit/Cargo.toml b/crates/bashkit/Cargo.toml
index ba28efdf6..2a0037f09 100644
--- a/crates/bashkit/Cargo.toml
+++ b/crates/bashkit/Cargo.toml
@@ -30,7 +30,7 @@ anyhow = { workspace = true }
 # Serialization
 serde = { workspace = true }
 serde_json = { workspace = true }
-serde_yaml_ng = { workspace = true, optional = true }
+serde_norway = { workspace = true, optional = true }
 
 # Regex
 regex = { workspace = true }
@@ -226,7 +226,7 @@ jq = [
     "dep:num-bigint",
     "dep:ryu",
     "dep:self_cell",
-    "dep:serde_yaml_ng",
+    "dep:serde_norway",
 ]
 # HTTP client (curl/wget) over rustls. Does NOT imply a crypto backend: pick
 # `ring` (on by default) or `aws-lc-rs`. Enabling neither is a compile error.
diff --git a/crates/bashkit/fuzz/Cargo.lock b/crates/bashkit/fuzz/Cargo.lock
index 25aa40eb6..14e8c05fa 100644
--- a/crates/bashkit/fuzz/Cargo.lock
+++ b/crates/bashkit/fuzz/Cargo.lock
@@ -121,12 +121,13 @@ dependencies = [
  "num-traits",
  "os_display",
  "regex",
+ "regex-automata",
  "rustls",
  "ryu",
  "self_cell",
  "serde",
  "serde_json",
- "serde_yaml_ng",
+ "serde_norway",
  "sha1",
  "sha2 0.11.0",
  "thiserror",
@@ -1673,16 +1674,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "serde_yaml_ng"
-version = "0.10.0"
+name = "serde_norway"
+version = "0.9.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b4db627b98b36d4203a7b458cf3573730f2bb591b28871d916dfa9efabfd41f"
+checksum = "e408f29489b5fd500fab51ff1484fc859bb655f32c671f307dcd733b72e8168c"
 dependencies = [
  "indexmap",
  "itoa",
  "ryu",
  "serde",
- "unsafe-libyaml",
+ "unsafe-libyaml-norway",
 ]
 
 [[package]]
@@ -1926,10 +1927,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81e544489bf3d8ef66c953931f56617f423cd4b5494be343d9b9d3dda037b9a3"
 
 [[package]]
-name = "unsafe-libyaml"
-version = "0.2.11"
+name = "unsafe-libyaml-norway"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
+checksum = "b39abd59bf32521c7f2301b52d05a6a2c975b6003521cbd0c6dc1582f0a22104"
 
 [[package]]
 name = "untrusted"
diff --git a/crates/bashkit/fuzz/fuzz_targets/yq_fuzz.rs b/crates/bashkit/fuzz/fuzz_targets/yq_fuzz.rs
index cfbe1fda9..8e22a7a48 100644
--- a/crates/bashkit/fuzz/fuzz_targets/yq_fuzz.rs
+++ b/crates/bashkit/fuzz/fuzz_targets/yq_fuzz.rs
@@ -68,7 +68,7 @@ fuzz_target!(|data: &[u8]| {
             &mut bash,
             &script,
             "yq_fuzz",
-            &["serde_yaml_ng::", "Mapping {", "TaggedValue {"],
+            &["serde_norway::", "Mapping {", "TaggedValue {"],
         )
         .await;
     });
diff --git a/crates/bashkit/src/builtins/yq.rs b/crates/bashkit/src/builtins/yq.rs
index b25602365..eb633fd20 100644
--- a/crates/bashkit/src/builtins/yq.rs
+++ b/crates/bashkit/src/builtins/yq.rs
@@ -461,16 +461,16 @@ fn parse_json_documents(input: &str) -> DataResult<Vec<serde_json::Value>> {
     Ok(values)
 }
 
-// THREAT[TM-DOS-101]: serde_yaml_ng rejects nesting beyond 128 while this
+// THREAT[TM-DOS-101]: serde_norway rejects nesting beyond 128 while this
 // conversion enforces Bashkit's lower shared structured-data depth of 100.
 fn parse_yaml_documents(input: &str) -> DataResult<Vec<serde_json::Value>> {
     reject_yaml_aliases(input)?;
     let mut values = Vec::new();
-    for document in serde_yaml_ng::Deserializer::from_str(input) {
+    for document in serde_norway::Deserializer::from_str(input) {
         if values.len() >= MAX_DOCUMENTS {
             anyhow::bail!("yq: document limit exceeded ({MAX_DOCUMENTS})");
         }
-        let yaml = serde_yaml_ng::Value::deserialize(document)
+        let yaml = serde_norway::Value::deserialize(document)
             .map_err(|error| anyhow::anyhow!("yq: invalid YAML: {error}"))?;
         let json = yaml_to_json(yaml, 0)?;
         values.push(json);
@@ -478,7 +478,7 @@ fn parse_yaml_documents(input: &str) -> DataResult<Vec<serde_json::Value>> {
     Ok(values)
 }
 
-// THREAT[TM-DOS-101]: serde_yaml_ng resolves aliases while deserializing, before
+// THREAT[TM-DOS-101]: serde_norway resolves aliases while deserializing, before
 // Bashkit can meter the expanded tree. Reject alias tokens with a bounded lexical
 // pass, while ignoring quoted and block scalar content, before invoking libyaml.
 fn reject_yaml_aliases(input: &str) -> DataResult<()> {
@@ -563,38 +563,38 @@ fn is_block_scalar_header(line: &[u8], index: usize) -> bool {
     suffix.is_empty() || suffix[0].is_ascii_whitespace() || suffix[0] == b'#'
 }
 
-fn yaml_to_json(value: serde_yaml_ng::Value, depth: usize) -> DataResult<serde_json::Value> {
+fn yaml_to_json(value: serde_norway::Value, depth: usize) -> DataResult<serde_json::Value> {
     if depth > MAX_DEPTH {
         anyhow::bail!("yq: nesting too deep ({depth} levels, max {MAX_DEPTH})");
     }
     Ok(match value {
-        serde_yaml_ng::Value::Null => serde_json::Value::Null,
-        serde_yaml_ng::Value::Bool(value) => serde_json::Value::Bool(value),
-        serde_yaml_ng::Value::Number(value) => {
+        serde_norway::Value::Null => serde_json::Value::Null,
+        serde_norway::Value::Bool(value) => serde_json::Value::Bool(value),
+        serde_norway::Value::Number(value) => {
             if value.as_f64().is_some_and(|number| !number.is_finite()) {
                 anyhow::bail!("yq: non-finite YAML number cannot be represented as JSON");
             }
             serde_json::to_value(value)
                 .map_err(|_| anyhow::anyhow!("yq: YAML number cannot be represented as JSON"))?
         }
-        serde_yaml_ng::Value::String(value) => serde_json::Value::String(value),
-        serde_yaml_ng::Value::Sequence(values) => serde_json::Value::Array(
+        serde_norway::Value::String(value) => serde_json::Value::String(value),
+        serde_norway::Value::Sequence(values) => serde_json::Value::Array(
             values
                 .into_iter()
                 .map(|value| yaml_to_json(value, depth + 1))
                 .collect::<DataResult<Vec<_>>>()?,
         ),
-        serde_yaml_ng::Value::Mapping(values) => {
+        serde_norway::Value::Mapping(values) => {
             let mut object = serde_json::Map::new();
             for (key, value) in values {
-                let serde_yaml_ng::Value::String(key) = key else {
+                let serde_norway::Value::String(key) = key else {
                     anyhow::bail!("yq: YAML mapping keys must be strings");
                 };
                 object.insert(key, yaml_to_json(value, depth + 1)?);
             }
             serde_json::Value::Object(object)
         }
-        serde_yaml_ng::Value::Tagged(_) => {
+        serde_norway::Value::Tagged(_) => {
             anyhow::bail!("yq: custom YAML tags are not supported");
         }
     })
@@ -665,7 +665,7 @@ fn render_results(values: &[serde_json::Value], args: &Args) -> DataResult<Strin
             output.push_str(value);
             output.push('\n');
         } else {
-            output.push_str(&serde_yaml_ng::to_string(value)?);
+            output.push_str(&serde_norway::to_string(value)?);
         }
     }
     Ok(output)
diff --git a/crates/bashkit/tests/integration/yq_integration_tests.rs b/crates/bashkit/tests/integration/yq_integration_tests.rs
index e009c69f1..7c0751594 100644
--- a/crates/bashkit/tests/integration/yq_integration_tests.rs
+++ b/crates/bashkit/tests/integration/yq_integration_tests.rs
@@ -74,7 +74,7 @@ async fn deep_yaml_is_rejected_without_panicking_or_leaking_internals() {
         &mut bash,
         &script,
         "yq_deep_yaml",
-        &["serde_yaml_ng::", "Mapping {", "TaggedValue {"],
+        &["serde_norway::", "Mapping {", "TaggedValue {"],
     )
     .await;
 }
diff --git a/crates/bashkit/tests/proptest_security.rs b/crates/bashkit/tests/proptest_security.rs
index 847e35b34..ff4a4f70f 100644
--- a/crates/bashkit/tests/proptest_security.rs
+++ b/crates/bashkit/tests/proptest_security.rs
@@ -404,7 +404,7 @@ proptest! {
             assert_fuzz_invariants(
                 &result,
                 "yq_arbitrary_yaml_and_filter",
-                &["serde_yaml_ng::", "Mapping {", "TaggedValue {"],
+                &["serde_norway::", "Mapping {", "TaggedValue {"],
             );
         }));
     }
diff --git a/examples/hyperlight/Cargo.lock b/examples/hyperlight/Cargo.lock
index cfc7050d6..c9e809751 100644
--- a/examples/hyperlight/Cargo.lock
+++ b/examples/hyperlight/Cargo.lock
@@ -76,6 +76,7 @@ dependencies = [
  "base64 0.23.1",
  "bigdecimal",
  "bitflags 2.13.2",
+ "blake2",
  "bstr",
  "bytes",
  "bzip2",
@@ -83,7 +84,7 @@ dependencies = [
  "clap",
  "fancy-regex",
  "flate2",
- "foldhash 0.1.5",
+ "foldhash",
  "futures-util",
  "getrandom",
  "hifijson",
@@ -96,11 +97,12 @@ dependencies = [
  "num-traits",
  "os_display",
  "regex",
+ "regex-automata",
  "ryu",
  "self_cell",
  "serde",
  "serde_json",
- "serde_yaml_ng",
+ "serde_norway",
  "sha1",
  "sha2",
  "thiserror",
@@ -159,6 +161,15 @@ version = "2.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3ded4057c258ba199e2d26386d3af3780957ecaee6c4ef4041c6b4b8b97c0b06"
 
+[[package]]
+name = "blake2"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b5d4d889834ee8ecfc0f8426ad30faf7cdcb10f741a8e6d7224d95325479f6f"
+dependencies = [
+ "digest",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.12.1"
@@ -413,12 +424,6 @@ dependencies = [
  "zlib-rs",
 ]
 
-[[package]]
-name = "foldhash"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
-
 [[package]]
 name = "foldhash"
 version = "0.2.0"
@@ -475,7 +480,7 @@ version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed5909b6e89a2db4456e54cd5f673791d7eca6732202bbf2a9cc504fe2f9b84a"
 dependencies = [
- "foldhash 0.2.0",
+ "foldhash",
 ]
 
 [[package]]
@@ -1041,16 +1046,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "serde_yaml_ng"
-version = "0.10.0"
+name = "serde_norway"
+version = "0.9.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b4db627b98b36d4203a7b458cf3573730f2bb591b28871d916dfa9efabfd41f"
+checksum = "e408f29489b5fd500fab51ff1484fc859bb655f32c671f307dcd733b72e8168c"
 dependencies = [
  "indexmap",
  "itoa",
  "ryu",
  "serde",
- "unsafe-libyaml",
+ "unsafe-libyaml-norway",
 ]
 
 [[package]]
@@ -1221,10 +1226,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81e544489bf3d8ef66c953931f56617f423cd4b5494be343d9b9d3dda037b9a3"
 
 [[package]]
-name = "unsafe-libyaml"
-version = "0.2.11"
+name = "unsafe-libyaml-norway"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
+checksum = "b39abd59bf32521c7f2301b52d05a6a2c975b6003521cbd0c6dc1582f0a22104"
 
 [[package]]
 name = "url"
diff --git a/knowledge/operations/dependencies.md b/knowledge/operations/dependencies.md
index f31bca772..fbbba52c8 100644
--- a/knowledge/operations/dependencies.md
+++ b/knowledge/operations/dependencies.md
@@ -93,6 +93,23 @@ the existing Python graph. Remove it when Monty's AST upgrades its string
 type. The Python binding's `num-bigint` dependency must still match Monty's
 0.4 line.
 
+## YAML maintenance boundary
+
+The `jq` feature's `yq` builtin uses `serde_norway` and
+`unsafe-libyaml-norway`, replacing `serde_yaml_ng` and the archived
+`unsafe-libyaml` (RUSTSEC-2024-0449). This changes maintenance ownership rather
+than the YAML contract: Serde values, multi-document iteration and YAML
+serialization remain, as does the parser's recursion ceiling of 128.
+Bashkit still rejects alias tokens before deserialization, limits conversion
+depth to 100, and shares the jq evaluator's existing limits (TM-DOS-101).
+
+The initial fork review compared the published `unsafe-libyaml` 0.2.11 library
+with `unsafe-libyaml-norway` 0.2.15: implementation files are identical; the
+library delta adds one lint allowance, while test executables also rename
+imports and simplify one loop. Dependency vet exemptions retain the prior
+criteria at exact replacement versions; no audit advisory was suppressed.
+Future version bumps still require source and contract review.
+
 ## Feature-unification edges
 
 `branches` is a direct dependency of `bashkit` under the `sqlite` feature and is
diff --git a/knowledge/security/threat-model.md b/knowledge/security/threat-model.md
index 5a9a80f84..e1cbd07fd 100644
--- a/knowledge/security/threat-model.md
+++ b/knowledge/security/threat-model.md
@@ -306,7 +306,7 @@ on default 2 MiB test threads (TM-DOS-044).
 | TM-DOS-132 | Completion spec and key binding growth | `complete -W "$big" nameN` or `bind -x '"\C-xN": cmd'` in a loop keeps per-shell state growing | At most 1024 completion specs of at most 64 KiB option text each, and at most 1024 `bind` changes of at most 4 KiB each, per interpreter; past a cap the builtin fails with status 1. The state is built on first use, lives in the interpreter (never global, so tenants never share it) and is copied into subshells like other shell state. Regression: `completion_specs_are_bounded`, `binding_changes_are_capped` | **MITIGATED** |
 | TM-DOS-134 | Repeated tilde expansion amplification | A large `HOME`, `PWD` or `OLDPWD` repeated through assignment `:~`, `:~+` or `:~-` prefixes builds host strings before retained-variable limits run | Shared tilde expansion borrows directory values, charges scan/copy work (including deadline and cancellation checks), and uses `BudgetedString` to admit checked capacity growth before allocation. Preprocessed assignment literals keep their leases and reserve their word copies until assignment consumption; mixed-word segments keep leases through field splitting. Synchronous operand failures use the sticky resource-error slot and abort word expansion. Regression tests: `execution_budget_tests::tilde_expansion_*` use bounded 1 KiB directory values, small live/work budgets, session recovery and a real-Bash oracle | **MITIGATED** |
 | TM-DOS-136 | Syntax diagnostic amplification | A multiline unexpected token combined with a long attacker-controlled `bash -c` ARG0 repeats the shell name for every token line, allocating quadratically before stderr capture | Unexpected-token messages and complete syntax reports use a fixed-capacity UTF-8 writer capped at 1 KiB before any append, stop formatting on overflow, and include `[diagnostic truncated]`; short reports preserve Bash semantics. Regressions: `error::tests::syntax_report_*`, `parser_bounds_unexpected_token_before_copying`, and `partial_parse_tests::{child_syntax_report_is_bounded, small_child_syntax_reports_match_bash}` | **MITIGATED** |
-| TM-DOS-101 | yq structured-data amplification | YAML aliases can expand exponentially during deserialization; deep YAML/JSON, document floods, jaq generators, and YAML re-serialization can consume stack, CPU, or memory beyond the source size | Reject YAML alias tokens with a bounded lexical pass before deserialization; VFS/stdin and aggregate input budgets; serde_yaml_ng recursion cap 128 plus Bashkit depth 100; 4096-document cap; shared jaq work/deadline/output limits; post-serialization stdout cap; YAML+JSON depth/document/input/output regressions plus `yq_fuzz` and arbitrary-input proptest | **MITIGATED** |
+| TM-DOS-101 | yq structured-data amplification | YAML aliases can expand exponentially during deserialization; deep YAML/JSON, document floods, jaq generators, and YAML re-serialization can consume stack, CPU, or memory beyond the source size | Reject YAML alias tokens with a bounded lexical pass before deserialization; VFS/stdin and aggregate input budgets; serde_norway recursion cap 128 plus Bashkit depth 100; 4096-document cap; shared jaq work/deadline/output limits; post-serialization stdout cap; YAML+JSON depth/document/input/output regressions plus `yq_fuzz` and arbitrary-input proptest | **MITIGATED** |
 | TM-DOS-133 | Unbounded prompt expansion | `x='${x@P}'; echo "${x@P}"`, mutual variable cycles or cycles through command substitutions repeatedly create shallow parsers and recursively poll futures | Prompt reparses count cumulative runtime depth capped at `min(max_ast_depth, 8)` before recursive polling; descendants inherit depth. Each prompt charges the shared work and aggregate-input budget, checking cancellation and deadlines before decoding; child parsers share the request budget and fail closed on poison. Depth unwinds on returned errors and resets at host execution boundaries. Regressions: `prompt_resource_tests`, `prompt_checks_cancellation_before_decoding`, `prompt_checks_shared_deadline_before_decoding`, `prompt_error_unwinds_depth` | **MITIGATED** |
 | TM-DOS-135 | Indirect array-target operand recursion | `r='a[0]:-${!r}]'; echo "${!r}"`: the bracket validator accepted trailing operator/nesting text, so desugar re-parsed `${a[0]:-${!r}]}` and the unset-element default re-entered indirect expansion without bound (stack overflow). Numbered to avoid collision with the adjacent tilde-budget entry | A bracket target is valid only when the first complete `[...]` reference (nesting- and quote-aware) consumes the whole value; any trailing text is refused with `invalid variable name`, like modern bash 5.x (older 3.2 ignored the tail). Refusal keeps a nested `${!...}` from ever reaching the desugar re-parse while valid nested subscripts (`a[b[0]]`) resolve whole; `$(`/backquote/process-substitution guards unchanged. Regressions: `indirect_array_boundary_rejects_trailing_operators`, `indirect_hostile_cycles_rejected_in_bounded_child`, `indirect_nested_indexed_matches_real_bash` | **MITIGATED** |
 | TM-DOS-137 | pr pagination amplification | A long `-h` title repeated once per empty line with `-l 11` grows gigabytes before a late output check; eager `-D` date copies amplify across retained inputs | Each row/output append checks the 16 MiB cap before growth; header parts append directly without a temporary title copy. Inputs retain date timestamps, formatting dates one nonempty stream at a time. Input lines, cells, rows and output lease capacity before allocation; cells borrow input text and pages borrow row slices. Input/row/page loops charge shared work, input bytes charge aggregate input, and budgeted growth polls cancellation/deadlines. Regressions: `pr_resource_tests`, cap/UTF-8/cancellation unit tests and `pr_allocation_tests` peak-heap bound | **MITIGATED** |
@@ -1538,7 +1538,7 @@ This section maps former vulnerability IDs to the new threat ID scheme and track
 | VFS copy/rename semantic bugs | TM-DOS-047, TM-DOS-048 | Fix limit check in copy(), type check in rename() | **MITIGATED** |
 | Date time info leak | TM-INF-018 | Closed UTC timezone default + sandbox-only IANA `TZ`; `fixed_epoch` / `epoch_offset` for clock virtualization | **MITIGATED** |
 | Python BashTool.reset() drops limits | TM-PY-028 | `BashTool::reset` rebuilds via `replace_live_bash_with_builder` matching `PyBash::reset` | **MITIGATED** |
-| yq parser/evaluator/output limits | TM-DOS-101 | Pre-deserialization alias rejection, serde_yaml_ng depth 128, Bashkit depth 100, 4096 documents, aggregate budget, shared jaq controls, final rendered-output cap | **MITIGATED** |
+| yq parser/evaluator/output limits | TM-DOS-101 | Pre-deserialization alias rejection, serde_norway depth 128, Bashkit depth 100, 4096 documents, aggregate budget, shared jaq controls, final rendered-output cap | **MITIGATED** |
 | Template engine depth limit | TM-DOS-052 | `depth` parameter on `render_template_inner` with `MAX_TEMPLATE_DEPTH = 100` | **MITIGATED** |
 | Unzip path traversal validation | TM-INJ-017 | `validate_extract_entry_path` rejects non-`Normal` components in `zip_cmd.rs` | **MITIGATED** |
 | Dotenv internal variable guard | TM-INJ-018 | `is_internal_variable()` check in `Dotenv::execute` (`builtins/dotenv.rs:138`) | **MITIGATED** |
diff --git a/site/src/data/performance-timeline.json b/site/src/data/performance-timeline.json
index 0da3b5969..5d9180bcd 100644
--- a/site/src/data/performance-timeline.json
+++ b/site/src/data/performance-timeline.json
@@ -1,5 +1,5 @@
 {
-  "generatedAt": "2026-10-09T17:39:25.000Z",
+  "generatedAt": "2026-10-13T02:14:50.000Z",
   "sources": {
     "bench": "crates/bashkit-bench/results/*.json",
     "criterion": "crates/bashkit/benches/results/*.md",
@@ -8,21 +8,21 @@
     "oilsSpec": "scripts/oils-spec/results/oils-spec-*.json"
   },
   "summary": {
-    "benchRuns": 10,
+    "benchRuns": 11,
     "criterionRuns": 18,
     "evalRuns": 57,
     "latestBench": {
-      "id": "bench-mykhailosmac-macos-aarch64-1788629833",
+      "id": "bench-mykhailosmin-macos-aarch64-1791857690",
       "kind": "bashkit-bench",
-      "label": "mykhailosmac-macos-aarch64",
-      "date": "2026-09-05",
-      "timestamp": "2026-09-05T17:37:13.000Z",
-      "source": "crates/bashkit-bench/results/bench-mykhailosmac-macos-aarch64-1788629833.json",
-      "reportSource": "crates/bashkit-bench/results/bench-mykhailosmac-macos-aarch64-1788629833.md",
+      "label": "mykhailosmin-macos-aarch64",
+      "date": "2026-10-13",
+      "timestamp": "2026-10-13T02:14:50.000Z",
+      "source": "crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.json",
+      "reportSource": "crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.md",
       "cases": 96,
-      "speedup": 49.9,
-      "bashkitMs": 20.16,
-      "bashMs": 1004.86,
+      "speedup": 58.1,
+      "bashkitMs": 27.91,
+      "bashMs": 1622.93,
       "errorRate": 0,
       "matchRate": 100,
       "categories": [
@@ -30,97 +30,97 @@
           "category": "startup",
           "description": "Small commands where interpreter startup dominates runtime.",
           "cases": 4,
-          "bashkitMedianMs": 0.016,
-          "bashMedianMs": 4.769,
-          "speedup": 293.2
+          "bashkitMedianMs": 0.031,
+          "bashMedianMs": 7.72,
+          "speedup": 241.3
         },
         {
           "category": "arithmetic",
           "description": "Integer math, substitutions, and expression-heavy shell snippets.",
           "cases": 6,
-          "bashkitMedianMs": 0.018,
-          "bashMedianMs": 4.313,
-          "speedup": 215.7
-        },
-        {
-          "category": "strings",
-          "description": "String expansion, pattern handling, and text manipulation.",
-          "cases": 8,
-          "bashkitMedianMs": 0.018,
-          "bashMedianMs": 4.378,
-          "speedup": 223.6
+          "bashkitMedianMs": 0.034,
+          "bashMedianMs": 6.172,
+          "speedup": 184
         },
         {
           "category": "variables",
           "description": "Variable assignment, lookup, expansion, and environment handling.",
           "cases": 8,
-          "bashkitMedianMs": 0.019,
-          "bashMedianMs": 4.096,
-          "speedup": 213.5
+          "bashkitMedianMs": 0.035,
+          "bashMedianMs": 5.948,
+          "speedup": 169
         },
         {
-          "category": "arrays",
-          "description": "Indexed array reads, writes, expansion, and iteration.",
-          "cases": 6,
-          "bashkitMedianMs": 0.019,
-          "bashMedianMs": 4.064,
-          "speedup": 209.2
+          "category": "strings",
+          "description": "String expansion, pattern handling, and text manipulation.",
+          "cases": 8,
+          "bashkitMedianMs": 0.039,
+          "bashMedianMs": 8.12,
+          "speedup": 186.4
         },
         {
           "category": "pipes",
           "description": "Pipeline construction, streaming, and command chaining.",
           "cases": 6,
-          "bashkitMedianMs": 0.021,
-          "bashMedianMs": 5.898,
-          "speedup": 264.2
-        },
-        {
-          "category": "subshell",
-          "description": "Command substitution and nested shell execution paths.",
-          "cases": 6,
-          "bashkitMedianMs": 0.024,
-          "bashMedianMs": 5.484,
-          "speedup": 233.3
+          "bashkitMedianMs": 0.041,
+          "bashMedianMs": 7.873,
+          "speedup": 175
         },
         {
           "category": "control",
           "description": "Conditionals, loops, case statements, and branching scripts.",
           "cases": 9,
-          "bashkitMedianMs": 0.025,
-          "bashMedianMs": 3.812,
-          "speedup": 171.4
+          "bashkitMedianMs": 0.047,
+          "bashMedianMs": 9.903,
+          "speedup": 169.5
+        },
+        {
+          "category": "subshell",
+          "description": "Command substitution and nested shell execution paths.",
+          "cases": 6,
+          "bashkitMedianMs": 0.048,
+          "bashMedianMs": 8.437,
+          "speedup": 180.4
         },
         {
           "category": "io",
           "description": "File reads, writes, redirects, and filesystem-facing commands.",
           "cases": 6,
-          "bashkitMedianMs": 0.027,
-          "bashMedianMs": 5.995,
-          "speedup": 247.3
+          "bashkitMedianMs": 0.052,
+          "bashMedianMs": 6.803,
+          "speedup": 155.8
         },
         {
           "category": "tools",
           "description": "Builtin and external-tool style command workloads.",
           "cases": 21,
-          "bashkitMedianMs": 0.031,
-          "bashMedianMs": 7.186,
-          "speedup": 216.7
+          "bashkitMedianMs": 0.055,
+          "bashMedianMs": 8.689,
+          "speedup": 176.4
+        },
+        {
+          "category": "arrays",
+          "description": "Indexed array reads, writes, expansion, and iteration.",
+          "cases": 6,
+          "bashkitMedianMs": 0.057,
+          "bashMedianMs": 7.128,
+          "speedup": 142.6
         },
         {
           "category": "complex",
           "description": "Mixed shell workflows that combine multiple language features.",
           "cases": 7,
-          "bashkitMedianMs": 0.065,
-          "bashMedianMs": 5.276,
-          "speedup": 78.3
+          "bashkitMedianMs": 0.09,
+          "bashMedianMs": 8.652,
+          "speedup": 66.5
         },
         {
           "category": "large",
           "description": "Bigger scripts and higher-volume data paths.",
           "cases": 9,
-          "bashkitMedianMs": 0.741,
-          "bashMedianMs": 4.593,
-          "speedup": 20.1
+          "bashkitMedianMs": 1.091,
+          "bashMedianMs": 7.415,
+          "speedup": 23.2
         }
       ]
     },
@@ -1603,6 +1603,119 @@
           "speedup": 20.1
         }
       ]
+    },
+    {
+      "id": "bench-mykhailosmin-macos-aarch64-1791857690",
+      "kind": "bashkit-bench",
+      "label": "mykhailosmin-macos-aarch64",
+      "date": "2026-10-13",
+      "timestamp": "2026-10-13T02:14:50.000Z",
+      "source": "crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.json",
+      "reportSource": "crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.md",
+      "cases": 96,
+      "speedup": 58.1,
+      "bashkitMs": 27.91,
+      "bashMs": 1622.93,
+      "errorRate": 0,
+      "matchRate": 100,
+      "categories": [
+        {
+          "category": "startup",
+          "description": "Small commands where interpreter startup dominates runtime.",
+          "cases": 4,
+          "bashkitMedianMs": 0.031,
+          "bashMedianMs": 7.72,
+          "speedup": 241.3
+        },
+        {
+          "category": "arithmetic",
+          "description": "Integer math, substitutions, and expression-heavy shell snippets.",
+          "cases": 6,
+          "bashkitMedianMs": 0.034,
+          "bashMedianMs": 6.172,
+          "speedup": 184
+        },
+        {
+          "category": "variables",
+          "description": "Variable assignment, lookup, expansion, and environment handling.",
+          "cases": 8,
+          "bashkitMedianMs": 0.035,
+          "bashMedianMs": 5.948,
+          "speedup": 169
+        },
+        {
+          "category": "strings",
+          "description": "String expansion, pattern handling, and text manipulation.",
+          "cases": 8,
+          "bashkitMedianMs": 0.039,
+          "bashMedianMs": 8.12,
+          "speedup": 186.4
+        },
+        {
+          "category": "pipes",
+          "description": "Pipeline construction, streaming, and command chaining.",
+          "cases": 6,
+          "bashkitMedianMs": 0.041,
+          "bashMedianMs": 7.873,
+          "speedup": 175
+        },
+        {
+          "category": "control",
+          "description": "Conditionals, loops, case statements, and branching scripts.",
+          "cases": 9,
+          "bashkitMedianMs": 0.047,
+          "bashMedianMs": 9.903,
+          "speedup": 169.5
+        },
+        {
+          "category": "subshell",
+          "description": "Command substitution and nested shell execution paths.",
+          "cases": 6,
+          "bashkitMedianMs": 0.048,
+          "bashMedianMs": 8.437,
+          "speedup": 180.4
+        },
+        {
+          "category": "io",
+          "description": "File reads, writes, redirects, and filesystem-facing commands.",
+          "cases": 6,
+          "bashkitMedianMs": 0.052,
+          "bashMedianMs": 6.803,
+          "speedup": 155.8
+        },
+        {
+          "category": "tools",
+          "description": "Builtin and external-tool style command workloads.",
+          "cases": 21,
+          "bashkitMedianMs": 0.055,
+          "bashMedianMs": 8.689,
+          "speedup": 176.4
+        },
+        {
+          "category": "arrays",
+          "description": "Indexed array reads, writes, expansion, and iteration.",
+          "cases": 6,
+          "bashkitMedianMs": 0.057,
+          "bashMedianMs": 7.128,
+          "speedup": 142.6
+        },
+        {
+          "category": "complex",
+          "description": "Mixed shell workflows that combine multiple language features.",
+          "cases": 7,
+          "bashkitMedianMs": 0.09,
+          "bashMedianMs": 8.652,
+          "speedup": 66.5
+        },
+        {
+          "category": "large",
+          "description": "Bigger scripts and higher-volume data paths.",
+          "cases": 9,
+          "bashkitMedianMs": 1.091,
+          "bashMedianMs": 7.415,
+          "speedup": 23.2
+        }
+      ]
     }
   ],
   "criterionRuns": [
@@ -9474,6 +9587,15 @@
       "detail": "86/88 tasks passed. Weakest category: build_system (0%).",
       "metric": 97.7,
       "source": "crates/bashkit-eval/results/mira/20261009T173925Z-a0a7/report.json"
+    },
+    {
+      "date": "2026-10-13",
+      "timestamp": "2026-10-13T02:14:50.000Z",
+      "kind": "Benchmark",
+      "title": "58.1x faster than bash",
+      "detail": "96 parity/perf cases on mykhailosmin-macos-aarch64; output match 100%.",
+      "metric": 58.1,
+      "source": "crates/bashkit-bench/results/bench-mykhailosmin-macos-aarch64-1791857690.json"
     }
   ]
 }
diff --git a/supply-chain/config.toml b/supply-chain/config.toml
index 85b1cc318..8caabf5e7 100644
--- a/supply-chain/config.toml
+++ b/supply-chain/config.toml
@@ -1739,9 +1739,10 @@ criteria = "safe-to-deploy"
 version = "1.0.151"
 criteria = "safe-to-deploy"
 
-[[exemptions.serde_yaml_ng]]
-version = "0.10.0"
+[[exemptions.serde_norway]]
+version = "0.9.42"
 criteria = "safe-to-deploy"
+notes = "Replaces serde_yaml_ng at the same exemption criteria; Serde API and 128-level recursion contract reviewed."
 
 [[exemptions.serdect]]
 version = "0.4.3"
@@ -2075,9 +2076,10 @@ criteria = "safe-to-deploy"
 version = "0.6.1"
 criteria = "safe-to-deploy"
 
-[[exemptions.unsafe-libyaml]]
-version = "0.2.11"
+[[exemptions.unsafe-libyaml-norway]]
+version = "0.2.15"
 criteria = "safe-to-deploy"
+notes = "Replaces archived unsafe-libyaml 0.2.11 at the same exemption criteria; published library implementation delta is one lint allowance."
 
 [[exemptions.untrusted]]
 version = "0.7.1"