fix(episode): forward-sync metadata equality trait

.github/workflows/paired-root.yml

@@ -83,4 +83,20 @@ jobs:
           cargo clippy --locked -p semantic-memory --all-targets -- -D warnings
           cargo test --locked -q -p semantic-memory --lib
           cargo test --locked -q -p semantic-memory --test foreign_key_integrity
+          cargo test --locked -q -p semantic-memory --test episode_meta_trait
           cargo package --locked -p semantic-memory --allow-dirty
+          # Cargo normalizes the release archive's workspace dependencies and
+          # path dependencies. Prove that archive independently of the paired
+          # Libraries source tree; do not claim the raw mirror checkout builds.
+          standalone="$RUNNER_TEMP/semantic-memory-package-${GITHUB_RUN_ID}-${GITHUB_RUN_ATTEMPT}"
+          test ! -e "$standalone"
+          mkdir "$standalone"
+          shopt -s nullglob
+          archives=("$CARGO_TARGET_DIR"/package/semantic-memory-*.crate)
+          test "${#archives[@]}" -eq 1
+          package_name="$(basename "${archives[0]}" .crate)"
+          tar -xzf "${archives[0]}" -C "$standalone"
+          manifest="$standalone/$package_name/Cargo.toml"
+          test -f "$manifest"
+          cargo metadata --locked --no-deps --format-version 1 --manifest-path "$manifest" > /dev/null
+          cargo test --locked -q --manifest-path "$manifest" --all-targets

src/types.rs

@@ -1144,7 +1144,7 @@ impl SearchSource {
 // ─── Episode Types ─────────────────────────────────────────────
 
 /// Metadata for a causal episode (PRIMITIVES_CONTRACT §4).
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct EpisodeMeta {
     /// IDs of the facts/chunks/messages that caused this episode.
     pub cause_ids: Vec<String>,

tests/episode_meta_trait.rs

@@ -0,0 +1,35 @@
+//! The mirror exposes the owner-owned EpisodeMeta equality trait without changing its wire form.
+use semantic_memory::{EpisodeMeta, EpisodeOutcome, VerificationStatus};
+use serde_json::{json, Value};
+
+#[test]
+fn episode_meta_equality_and_serialization_are_distinct_contracts(
+) -> Result<(), Box<dyn std::error::Error>> {
+    let meta = EpisodeMeta {
+        cause_ids: vec!["cause:1".to_owned()],
+        effect_type: "test_failure".to_owned(),
+        outcome: EpisodeOutcome::Pending,
+        confidence: 0.5,
+        verification_status: VerificationStatus::Unverified,
+        experiment_id: None,
+        valid_time: None,
+        fact_digest: None,
+    };
+    let expected: Value = json!({
+        "cause_ids": ["cause:1"],
+        "effect_type": "test_failure",
+        "outcome": "pending",
+        "confidence": 0.5,
+        "verification_status": {"status": "unverified"},
+        "experiment_id": null,
+        "valid_time": null,
+        "fact_digest": null
+    });
+    assert_eq!(serde_json::to_value(&meta)?, expected);
+    let restored: EpisodeMeta = serde_json::from_value(expected)?;
+    assert_eq!(meta, restored);
+    let mut changed = restored.clone();
+    changed.effect_type = "regression".to_owned();
+    assert_ne!(meta, changed);
+    Ok(())
+}