Preserve header sensitivity across colliding path shapes

docs/roadmap/implementation.md

@@ -692,3 +692,18 @@ unsafe evidence query, or release gate. Reviewed behavioral coverage in
 No runtime code changed in this documentation unit, so the race suite was not
 rerun. No environmental limitation affected validation; checks ran on
 Linux/amd64 only. Publication and release preparation remain outside this work.
+
+## Post-implementation remediation evidence
+
+The subsequent review found coverage gaps beyond the original stage validation;
+the [remediation record](remediation.md#shared-source-version-review-2026-10-15)
+owns their status. Stage 9–12 evidence now also includes
+`TestSourceVersionEvidenceClassificationKeepsCollidingShapes` and
+`TestFacadeSourceVersionEvidenceRedactsCollidingShapes`. Both failed before the
+shape-collision fix and pass afterward. Classification preserves original
+mapping-key and sequence-index candidates independently without erasing payload
+classification. Focused source-version/sensitivity/history tests,
+`GOTOOLCHAIN=local ./scripts/check.sh`, and
+`GOTOOLCHAIN=local GOPROXY=off go test -race ./...` passed on
+`go1.26.9 linux/amd64`. Existing historical/dependency propagation and neighboring
+public-value coverage remain green; no new sensitivity policy was introduced.

docs/roadmap/remediation.md

@@ -162,7 +162,14 @@ issues remain. Findings 1 and 2 above remain completed historical findings.
 
 ### 3. Preserve distinct semantic shapes during evidence classification (P1)
 
-Status: open.
+Status: complete. Original evidence shapes are classified independently before
+their results enter the existing pointer-based sensitivity/dependency closure.
+Evidence no longer overwrites payload candidates. New engine and public
+regressions failed before the fix and pass afterward, covering both acquisition
+orders, schema tags, predicate observation of both shapes, and unchanged final
+payload. Focused source-version/sensitivity/history tests, the everyday check,
+and the full race suite passed on `go1.26.9 linux/amd64`. The implementation
+plan records the additional Stage 9–12 regression evidence.
 
 Affected: `classifySecretPathsWithEvidence` and `addSecretEvidencePath` in
 [secret.go](../../internal/engine/secret.go), lines 78–104 at `020d720`.