diff --git a/openspec/changes/archive/2026-09-22-fill-linter-config-files/.openspec.yaml b/openspec/changes/archive/2026-09-22-fill-linter-config-files/.openspec.yaml
new file mode 100644
index 0000000..a9eca53
--- /dev/null
+++ b/openspec/changes/archive/2026-09-22-fill-linter-config-files/.openspec.yaml
@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-09-22
\ No newline at end of file
diff --git a/openspec/changes/archive/2026-09-22-fill-linter-config-files/design.md b/openspec/changes/archive/2026-09-22-fill-linter-config-files/design.md
new file mode 100644
index 0000000..5d1605e
--- /dev/null
+++ b/openspec/changes/archive/2026-09-22-fill-linter-config-files/design.md
@@ -0,0 +1,57 @@
+## Context
+
+- `hooks/env_check.py::detect_linter_config`（M8 后）：`for lang_id, lang_def in REGISTRY.items(): files = lang_def.get("linter_config_files") or []` → 存在性过滤 → `{lang: [files]}`。**填错无害**（不存在的文件名永远不命中），这是本 change 敢于「保守估计 + 宽清单」的依据。
+- 现状覆盖：java / rust / typescript / python 四条（M8 迁移自旧硬编码常量）。
+- 关键区分（M8 design 遗留）：`requiresConfig` **不等于** linter 配置——java 的 `requiresConfig` 是 `pom.xml` 等项目文件（gate 判定「项目是否接入」用），**不是** linter 配置文件；直接把 requiresConfig 拷进 linter_config_files 会造成误报（SessionStart 会说「linter 配置：pom.xml」）。只有 requiresConfig 本身就是 linter 配置的条目（yaml 的 `.yamllint*`、markdown 的 `.markdownlint*`、scala 的 `.scalafmt.conf`、erlang 的 `elvis.config*`、protobuf 的 `buf.yaml`、vue/svelte/astro 的 eslint 系）可直接复制。
+
+## Decisions
+
+### 保守清单（只填确定存在的标准配置名）
+
+按语言分组（~30 条）：
+
+- go: `.golangci.yml`, `.golangci.yaml`
+- shell: `.shellcheckrc`
+- dockerfile: `.hadolint.yaml`, `.hadolint.yml`
+- yaml: `.yamllint`, `.yamllint.yaml`, `.yamllint.yml`（requiresConfig 即 linter 配置，直接复制）
+- markdown: `.markdownlint-cli2.*` / `.markdownlint.*` 九件套（同上复制）
+- vue / svelte / astro: eslint 系（requiresConfig 直接复制）
+- ruby: `.rubocop.yml`, `.rubocop.yaml`
+- php: `phpstan.neon`, `phpstan.neon.dist`, `psalm.xml`
+- swift: `.swiftlint.yml`, `.swiftlint.yaml`
+- kotlin: `detekt.yml`, `detekt.yaml`
+- dart: `analysis_options.yaml`
+- elixir: `.credo.exs`
+- c / cpp / objc / cuda: `.clang-tidy`, `.clang-format`
+- css: `.stylelintrc`, `.stylelintrc.json`, `.stylelintrc.yml`, `stylelint.config.js`
+- html: `.htmlhintrc`
+- terraform: `.tflint.hcl`, `tflint.hcl`
+- sql: `.sqlfluff`
+- haskell: `.hlint.yaml`, `.hlint.yml`
+- ocaml: `.ocamlformat`
+- perl: `.perlcriticrc`
+- clojure: `.clj-kondo/config.edn`
+- powershell: `PSScriptAnalyzerSettings.psd1`
+- crystal: `.ameba.yml`
+- lua: `.luacheckrc`
+- r: `.lintr`
+- ansible: `.ansible-lint`
+- solidity: `.solhint.json`, `.solhintrc`
+- scala: `.scalafmt.conf`（requiresConfig 复制）
+- erlang: `elvis.config`, `elvis.config.js`（requiresConfig 复制）
+- protobuf: `buf.yaml`, `buf.gen.yaml`, `buf.work.yaml`（requiresConfig 复制）
+
+**明确不填**（低置信或无标准配置名）：graphql、toml、zig、nim、julia、pascal、liquid、luau、nix、groovy、cfml、fsharp、vbnet、csharp、elm、objc→已填 clang、cfml 等——留空数组是诚实状态。
+
+### 守护测试
+
+`test_linter_config_files_coverage`：stable/beta 中非空 `linter_config_files` 数量 ≥ 25（当前应 ~34）。防止未来语言注册表重构静默清空填充。
+
+### 不动 requiresConfig 语义
+
+两条字段语义分离是 M8 的设计决定，本 change 遵守：requiresConfig 服务 gate 判定，linter_config_files 服务 SessionStart 盘点。
+
+## Risks / Trade-offs
+
+- 个别配置名猜错 → 该文件不存在 → 盘点不报 → 无副作用。
+- 个别语言存在更流行的配置名（如 graphql 的 `.graphqlrc`）→ 未填 → 盘点少报一项 → 未来按需补，本 change 不冒进。
\ No newline at end of file
diff --git a/openspec/changes/archive/2026-09-22-fill-linter-config-files/proposal.md b/openspec/changes/archive/2026-09-22-fill-linter-config-files/proposal.md
new file mode 100644
index 0000000..d7b236f
--- /dev/null
+++ b/openspec/changes/archive/2026-09-22-fill-linter-config-files/proposal.md
@@ -0,0 +1,23 @@
+## Why
+
+M8（v0.6.5）把 `hooks/env_check.py` 的 linter 配置盘点改为从 `scripts/languages.json` 的 `linter_config_files` 字段读取，但当时只迁移了 java/rust/typescript/python 四条历史记录——54 条 stable/beta 语言中仍有约 30 条填着默认空数组，SessionStart 钩子对它们的项目依旧报告「未配置任何 linter」，即使项目里躺着 `.golangci.yml`、`.rubocop.yml`、`.shellcheckrc` 等真实配置。这就是评审遗留的「detect_linter_config 推全局」。
+
+## What Changes
+
+- `scripts/languages.json`：为约 30 条 stable/beta 语言填充 `linter_config_files`（**保守清单**：只填确定存在的业界标准配置文件名，如 `.golangci.yml` / `.shellcheckrc` / `.rubocop.yml` / `.swiftlint.yml` / `analysis_options.yaml` / `.credo.exs` / `.clang-tidy` / `.stylelintrc*` / `.shellcheckrc` 等）。填错无副作用——`detect_linter_config` 只报告**实际存在**的文件，永不误报；填漏只影响盘点广度，不影响正确性。
+- `tests/test_validate_languages_json.py` 新增 1 条守护：stable/beta 语言中非空 `linter_config_files` 的数量 ≥ 25（防止未来重构把填充结果清空）。
+- 不改 `hooks/env_check.py`（M8 已 registry 驱动）；不改 `scripts/languages.json` 其他字段；不改 `docs/LANGUAGES.md` 生成逻辑（生成器不读该字段，已实测）。
+
+## Capabilities
+
+### New Capabilities
+
+None.
+
+### Modified Capabilities
+
+- `registry-driven-config`: 新增 Requirement——已知配置文件名的 stable/beta 语言 SHALL 填充该字段，SessionStart 盘点覆盖面由数据而非代码决定。
+
+## Impact
+
+约 30 条语言 JSON 条目各加 1-4 个字符串；1 条测试；spec delta 1 条 Requirement + 2 Scenario。零运行时行为变化（除 SessionStart 报告更全）。
\ No newline at end of file
diff --git a/openspec/changes/archive/2026-09-22-fill-linter-config-files/specs/registry-driven-config/spec.md b/openspec/changes/archive/2026-09-22-fill-linter-config-files/specs/registry-driven-config/spec.md
new file mode 100644
index 0000000..58b94b7
--- /dev/null
+++ b/openspec/changes/archive/2026-09-22-fill-linter-config-files/specs/registry-driven-config/spec.md
@@ -0,0 +1,24 @@
+## ADDED Requirements
+
+### Requirement: Known linter config filenames SHALL be populated for stable/beta languages
+
+For each stable/beta language whose linter has well-known project-level configuration filenames, `scripts/languages.json` SHALL populate that entry's `linter_config_files` with those filenames. The population SHALL be conservative: only filenames that genuinely exist as that linter's configuration. Entries whose linter has no standard config filename (or where the filename is uncertain) MAY keep the empty list. `hooks/env_check.py` SHALL continue to report only files that actually exist, so an over-guessed filename never produces a false report.
+
+#### Scenario: A Go project carries .golangci.yml
+
+- **WHEN** the SessionStart hook runs in a repository whose root contains `.golangci.yml`
+- **THEN** `detect_linter_config` reports `{"go": [".golangci.yml"]}` because `go.linter_config_files` includes it
+
+#### Scenario: A guessed filename does not exist in the project
+
+- **WHEN** a language lists a config filename that the current project does not contain
+- **THEN** the hook reports nothing for that language/file pair — existence filtering prevents false positives
+
+### Requirement: Linter config coverage SHALL be guarded against regression
+
+`tests/test_validate_languages_json.py` SHALL assert that at least 25 stable/beta languages have a non-empty `linter_config_files` list, so a registry refactor cannot silently wipe the populated coverage.
+
+#### Scenario: A refactor drops the populated fields
+
+- **WHEN** a future edit removes `linter_config_files` from most stable/beta entries
+- **THEN** the coverage test fails with the current populated count
\ No newline at end of file
diff --git a/openspec/changes/archive/2026-09-22-fill-linter-config-files/tasks.md b/openspec/changes/archive/2026-09-22-fill-linter-config-files/tasks.md
new file mode 100644
index 0000000..bdb0c45
--- /dev/null
+++ b/openspec/changes/archive/2026-09-22-fill-linter-config-files/tasks.md
@@ -0,0 +1,19 @@
+## 1. Data fill
+
+- [x] 1.1 Apply the conservative per-language map from design.md to `scripts/languages.json` (~30 stable/beta entries).
+- [x] 1.2 `python3 scripts/validate_languages_json.py` — exit 0 (type rule covers the new values).
+
+## 2. Coverage guard test
+
+- [x] 2.1 Add `test_linter_config_files_coverage` (≥25 stable/beta with non-empty list) to `tests/test_validate_languages_json.py`.
+
+## 3. Validation
+
+- [x] 3.1 `python3 -m unittest discover -s tests -p 'test_*.py' -v` — all pass.
+- [x] 3.2 `python3 tests/run_all.py` — 141 / 0 / 0.
+- [x] 3.3 `git diff --check` — clean; `openspec validate --all --strict` — pass.
+
+## 4. Release
+
+- [x] 4.1 bump patch → 0.6.8; in-repo marketplace pins → v0.6.8; feat PR → merge; release PR → merge; tag v0.6.8; market repo catalog + README row → 0.6.8.
+- [x] 4.2 `openspec archive fill-linter-config-files`.
\ No newline at end of file
diff --git a/openspec/specs/registry-driven-config/spec.md b/openspec/specs/registry-driven-config/spec.md
index 3bdb213..a13c385 100644
--- a/openspec/specs/registry-driven-config/spec.md
+++ b/openspec/specs/registry-driven-config/spec.md
@@ -26,3 +26,26 @@ Every language entry in `scripts/languages.json` SHALL have a `linter_config_fil
 - **WHEN** the project's root contains `ruff.toml` but no other linter configs
 - **THEN** `env_check.detect_linter_config` returns `{"python": ["ruff.toml"]}` (or equivalent from the registry) and excludes all other languages
 
+### Requirement: Known linter config filenames SHALL be populated for stable/beta languages
+
+For each stable/beta language whose linter has well-known project-level configuration filenames, `scripts/languages.json` SHALL populate that entry's `linter_config_files` with those filenames. The population SHALL be conservative: only filenames that genuinely exist as that linter's configuration. Entries whose linter has no standard config filename (or where the filename is uncertain) MAY keep the empty list. `hooks/env_check.py` SHALL continue to report only files that actually exist, so an over-guessed filename never produces a false report.
+
+#### Scenario: A Go project carries .golangci.yml
+
+- **WHEN** the SessionStart hook runs in a repository whose root contains `.golangci.yml`
+- **THEN** `detect_linter_config` reports `{"go": [".golangci.yml"]}` because `go.linter_config_files` includes it
+
+#### Scenario: A guessed filename does not exist in the project
+
+- **WHEN** a language lists a config filename that the current project does not contain
+- **THEN** the hook reports nothing for that language/file pair — existence filtering prevents false positives
+
+### Requirement: Linter config coverage SHALL be guarded against regression
+
+`tests/test_validate_languages_json.py` SHALL assert that at least 25 stable/beta languages have a non-empty `linter_config_files` list, so a registry refactor cannot silently wipe the populated coverage.
+
+#### Scenario: A refactor drops the populated fields
+
+- **WHEN** a future edit removes `linter_config_files` from most stable/beta entries
+- **THEN** the coverage test fails with the current populated count
+
diff --git a/scripts/languages.json b/scripts/languages.json
index 327d451..a1c96c8 100644
--- a/scripts/languages.json
+++ b/scripts/languages.json
@@ -187,6 +187,10 @@
       "install_hint": "内置于 Go 工具链；聚合 lint 可装 golangci-lint",
       "requiresConfig": [
         "go.mod"
+      ],
+      "linter_config_files": [
+        ".golangci.yml",
+        ".golangci.yaml"
       ]
     },
     {
@@ -237,6 +241,10 @@
         "build.gradle.kts",
         "settings.gradle",
         "pom.xml"
+      ],
+      "linter_config_files": [
+        "detekt.yml",
+        "detekt.yaml"
       ]
     },
     {
@@ -257,7 +265,11 @@
         "swiftlint",
         "--fix"
       ],
-      "install_hint": "brew install swiftlint"
+      "install_hint": "brew install swiftlint",
+      "linter_config_files": [
+        ".swiftlint.yml",
+        ".swiftlint.yaml"
+      ]
     },
     {
       "id": "php",
@@ -284,6 +296,11 @@
         "bash",
         "-c",
         "find . -name '*.php' -type f -not -path '*/vendor/*' -print0 | xargs -0 -n1 php -l"
+      ],
+      "linter_config_files": [
+        "phpstan.neon",
+        "phpstan.neon.dist",
+        "psalm.xml"
       ]
     },
     {
@@ -304,7 +321,11 @@
         "rubocop",
         "-A"
       ],
-      "install_hint": "gem install rubocop"
+      "install_hint": "gem install rubocop",
+      "linter_config_files": [
+        ".rubocop.yml",
+        ".rubocop.yaml"
+      ]
     },
     {
       "id": "scala",
@@ -329,6 +350,9 @@
       "install_hint": "coursier install scalafmt",
       "requiresConfig": [
         ".scalafmt.conf"
+      ],
+      "linter_config_files": [
+        ".scalafmt.conf"
       ]
     },
     {
@@ -356,6 +380,9 @@
         "bash",
         "-c",
         "find . \\( -name '*.sh' -o -name '*.bash' -o -name '*.zsh' \\) -type f -not -path '*/node_modules/*' -print0 | xargs -0 shellcheck --severity=warning"
+      ],
+      "linter_config_files": [
+        ".shellcheckrc"
       ]
     },
     {
@@ -380,6 +407,10 @@
         "bash",
         "-c",
         "find . \\( -name 'Dockerfile' -o -name 'Dockerfile.*' -o -name 'Containerfile' \\) -type f -not -path '*/node_modules/*' -print0 | xargs -0 -r hadolint"
+      ],
+      "linter_config_files": [
+        ".hadolint.yaml",
+        ".hadolint.yml"
       ]
     },
     {
@@ -405,6 +436,11 @@
         ".yamllint",
         ".yamllint.yaml",
         ".yamllint.yml"
+      ],
+      "linter_config_files": [
+        ".yamllint",
+        ".yamllint.yaml",
+        ".yamllint.yml"
       ]
     },
     {
@@ -431,6 +467,9 @@
       "install_hint": "项目需配置 credo 依赖",
       "requiresConfig": [
         "mix.exs"
+      ],
+      "linter_config_files": [
+        ".credo.exs"
       ]
     },
     {
@@ -463,6 +502,12 @@
         "--no-install",
         "stylelint",
         "--version"
+      ],
+      "linter_config_files": [
+        ".stylelintrc",
+        ".stylelintrc.json",
+        ".stylelintrc.yml",
+        "stylelint.config.js"
       ]
     },
     {
@@ -490,6 +535,10 @@
         "bash",
         "-c",
         "find . -name '*.c' -o -name '*.h' | xargs -r clang-tidy --quiet"
+      ],
+      "linter_config_files": [
+        ".clang-tidy",
+        ".clang-format"
       ]
     },
     {
@@ -518,6 +567,10 @@
         "bash",
         "-c",
         "find . \\( -name '*.cpp' -o -name '*.hpp' -o -name '*.cc' \\) -type f -print0 | xargs -0 -r clang-tidy --quiet"
+      ],
+      "linter_config_files": [
+        ".clang-tidy",
+        ".clang-format"
       ]
     },
     {
@@ -545,6 +598,10 @@
         "bash",
         "-c",
         "find . -name '*.m' -o -name '*.mm' | xargs -r clang-tidy --quiet"
+      ],
+      "linter_config_files": [
+        ".clang-tidy",
+        ".clang-format"
       ]
     },
     {
@@ -570,6 +627,9 @@
       "install_hint": "Dart SDK 内置",
       "requiresConfig": [
         "pubspec.yaml"
+      ],
+      "linter_config_files": [
+        "analysis_options.yaml"
       ]
     },
     {
@@ -615,6 +675,18 @@
         ".pre-commit-config.yaml",
         ".eslintrc",
         ".eslintrc.cjs"
+      ],
+      "linter_config_files": [
+        "eslint.config.js",
+        "eslint.config.mjs",
+        "eslint.config.cjs",
+        "eslint.config.ts",
+        ".eslintrc.json",
+        ".eslintrc.js",
+        ".eslintrc.yml",
+        ".pre-commit-config.yaml",
+        ".eslintrc",
+        ".eslintrc.cjs"
       ]
     },
     {
@@ -654,6 +726,16 @@
         ".eslintrc.js",
         ".eslintrc.yml",
         ".pre-commit-config.yaml"
+      ],
+      "linter_config_files": [
+        "eslint.config.js",
+        "eslint.config.mjs",
+        "eslint.config.cjs",
+        "eslint.config.ts",
+        ".eslintrc.json",
+        ".eslintrc.js",
+        ".eslintrc.yml",
+        ".pre-commit-config.yaml"
       ]
     },
     {
@@ -693,6 +775,16 @@
         ".eslintrc.js",
         ".eslintrc.yml",
         ".pre-commit-config.yaml"
+      ],
+      "linter_config_files": [
+        "eslint.config.js",
+        "eslint.config.mjs",
+        "eslint.config.cjs",
+        "eslint.config.ts",
+        ".eslintrc.json",
+        ".eslintrc.js",
+        ".eslintrc.yml",
+        ".pre-commit-config.yaml"
       ]
     },
     {
@@ -713,7 +805,11 @@
         "--plugin=prettier-plugin-solidity",
         "--write"
       ],
-      "install_hint": "npm install -g solhint prettier prettier-plugin-solidity"
+      "install_hint": "npm install -g solhint prettier prettier-plugin-solidity",
+      "linter_config_files": [
+        ".solhint.json",
+        ".solhintrc"
+      ]
     },
     {
       "id": "terraform",
@@ -733,7 +829,11 @@
         "terraform",
         "fmt"
       ],
-      "install_hint": "brew install tflint"
+      "install_hint": "brew install tflint",
+      "linter_config_files": [
+        ".tflint.hcl",
+        "tflint.hcl"
+      ]
     },
     {
       "id": "nix",
@@ -792,6 +892,9 @@
         "bash",
         "-c",
         "find . \\( -name '*.html' -o -name '*.htm' \\) -type f -not -path '*/node_modules/*' -exec grep -L '<%' {} + | xargs -0 -r npx --no-install htmlhint"
+      ],
+      "linter_config_files": [
+        ".htmlhintrc"
       ]
     },
     {
@@ -817,6 +920,9 @@
         "bash",
         "-c",
         "find . -name '*.sql' -type f -not -path '*/node_modules/*' -print0 | xargs -0 -r sqlfluff lint"
+      ],
+      "linter_config_files": [
+        ".sqlfluff"
       ]
     },
     {
@@ -875,6 +981,11 @@
         "buf.yaml",
         "buf.gen.yaml",
         "buf.work.yaml"
+      ],
+      "linter_config_files": [
+        "buf.yaml",
+        "buf.gen.yaml",
+        "buf.work.yaml"
       ]
     },
     {
@@ -919,6 +1030,17 @@
         ".markdownlint.yaml",
         ".markdownlint.yml",
         ".markdownlint.ini"
+      ],
+      "linter_config_files": [
+        ".markdownlint-cli2.jsonc",
+        ".markdownlint-cli2.json",
+        ".markdownlint-cli2.yaml",
+        ".markdownlint-cli2.yml",
+        ".markdownlint.jsonc",
+        ".markdownlint.json",
+        ".markdownlint.yaml",
+        ".markdownlint.yml",
+        ".markdownlint.ini"
       ]
     },
     {
@@ -963,7 +1085,11 @@
         "-i",
         "."
       ],
-      "install_hint": "brew install hlint fourmolu"
+      "install_hint": "brew install hlint fourmolu",
+      "linter_config_files": [
+        ".hlint.yaml",
+        ".hlint.yml"
+      ]
     },
     {
       "id": "ocaml",
@@ -985,7 +1111,10 @@
         "-i",
         "."
       ],
-      "install_hint": "opam install ocamlformat"
+      "install_hint": "opam install ocamlformat",
+      "linter_config_files": [
+        ".ocamlformat"
+      ]
     },
     {
       "id": "fsharp",
@@ -1033,6 +1162,9 @@
       "gate": [
         "perlcritic",
         "."
+      ],
+      "linter_config_files": [
+        ".perlcriticrc"
       ]
     },
     {
@@ -1087,7 +1219,10 @@
       "format": [
         "cljstyle"
       ],
-      "install_hint": "brew install clj-kondo cljstyle"
+      "install_hint": "brew install clj-kondo cljstyle",
+      "linter_config_files": [
+        ".clj-kondo/config.edn"
+      ]
     },
     {
       "id": "powershell",
@@ -1111,7 +1246,10 @@
         "-Command",
         "Invoke-Formatter"
       ],
-      "install_hint": "Install-Module PSScriptAnalyzer"
+      "install_hint": "Install-Module PSScriptAnalyzer",
+      "linter_config_files": [
+        "PSScriptAnalyzerSettings.psd1"
+      ]
     },
     {
       "id": "zig",
@@ -1185,6 +1323,9 @@
       "install_hint": "brew install crystal-ameba",
       "requiresConfig": [
         "shard.yml"
+      ],
+      "linter_config_files": [
+        ".ameba.yml"
       ]
     },
     {
@@ -1246,7 +1387,10 @@
         "stylua",
         "."
       ],
-      "install_hint": "luarocks install luacheck; cargo install stylua"
+      "install_hint": "luarocks install luacheck; cargo install stylua",
+      "linter_config_files": [
+        ".luacheckrc"
+      ]
     },
     {
       "id": "luau",
@@ -1313,7 +1457,10 @@
         "::",
         "style_dir"
       ],
-      "install_hint": "Rscript -e 'install.packages(c(\"lintr\",\"styler\"))'"
+      "install_hint": "Rscript -e 'install.packages(c(\"lintr\",\"styler\"))'",
+      "linter_config_files": [
+        ".lintr"
+      ]
     },
     {
       "id": "cfml",
@@ -1401,6 +1548,10 @@
       "requiresConfig": [
         "elvis.config",
         "elvis.config.js"
+      ],
+      "linter_config_files": [
+        "elvis.config",
+        "elvis.config.js"
       ]
     },
     {
@@ -1470,6 +1621,10 @@
         "bash",
         "-c",
         "find . -name '*.cu' | xargs -r clang-tidy --quiet"
+      ],
+      "linter_config_files": [
+        ".clang-tidy",
+        ".clang-format"
       ]
     },
     {
@@ -1489,7 +1644,10 @@
         "ansible-lint",
         "--fix"
       ],
-      "install_hint": "playbook 检查由 ansible-lint 承接（yaml 通道）；语义级检查待集成"
+      "install_hint": "playbook 检查由 ansible-lint 承接（yaml 通道）；语义级检查待集成",
+      "linter_config_files": [
+        ".ansible-lint"
+      ]
     }
   ]
 }
diff --git a/tests/test_validate_languages_json.py b/tests/test_validate_languages_json.py
index 4cb1848..aeb3b1d 100644
--- a/tests/test_validate_languages_json.py
+++ b/tests/test_validate_languages_json.py
@@ -111,3 +111,11 @@ def test_linter_config_files_must_be_list_of_str(self) -> None:
     def test_linter_config_files_can_be_empty(self) -> None:
         reg = _mutate(_baseline(), "rust", linter_config_files=[])
         self.assertEqual([], check(reg))
+
+class LinterConfigCoverageTest(unittest.TestCase):
+    def test_linter_config_files_coverage(self) -> None:
+        """stable/beta 中至少 25 条填了 linter_config_files（防重构清空）。"""
+        reg = _baseline()
+        n = sum(1 for l in reg["languages"]
+                if l.get("status") in ("stable", "beta") and l.get("linter_config_files"))
+        self.assertGreaterEqual(n, 25, f"only {n} stable/beta languages have linter_config_files")