Audit source version lifecycle agreement

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implement shared source version checks
 
-Status: Stages 1–10 complete; public source evidence remains private.
+Status: Stages 1–12 complete; adoption examples and documentation reconciliation remain.
 
 Audience: a Luna coding agent implementing one numbered stage per prompt, in
 order. The [feature roadmap](source-version-checks.md) owns target behavior and
@@ -573,7 +573,7 @@ These checks passed with Go `go1.26.8 linux/amd64`:
 
 No environmental limitation affected validation; checks ran on Linux/amd64.
 
-## Stage 12 — Audit lifecycle agreement and compatibility
+## Stage 12 — Audit lifecycle agreement and compatibility — Done
 
 1. Map tests to every roadmap participation row/edge decision; add only missing
    cross-boundary regressions with one primary owner per behavior.
@@ -594,6 +594,27 @@ No environmental limitation affected validation; checks ran on Linux/amd64.
 Done: all target behavior has public-boundary evidence and deterministic checks
 pass, without extra contract restrictions or redundant coverage.
 
+Completion evidence: mapped source-local lookup, malformed/overlapping headers,
+consumption, roles, mounted protection, directives, and source participation to
+the focused `source_version_test.go` suite; mapped classification and historical
+propagation to `secret_classification_test.go`, `inheritance_secret_test.go`,
+and the recorded-dependency regression; and retained existing destination,
+accounting, resource-context, and default-mode suites as the owners for those
+boundaries. Added a public-facade lifecycle regression that accepts distinct
+main/underlay declarations while verifying exact large-integer decoding,
+zero/false/null, defaults, one resolved configuration, secret lookup, validation,
+evidence retention, and unchanged effective explanation/rendering/Diff. No
+source-order promise or additional policy was introduced. These checks passed
+with Go `go1.26.8 linux/amd64`:
+
+- `GOTOOLCHAIN=local GOPROXY=off go test ./internal/engine -run 'SourceVersion|Version|Import|Underlay|Overlay|Destination|Secret|Sensitivity|History|Inheritance|Resolution' -count=1`
+- `GOTOOLCHAIN=local GOPROXY=off go test . -run 'SourceVersion|Version|Layered|SourceInfo|Destination|Diff|PublicFacadeBoundary|DependencyImportBoundary' -count=1`
+- `GOTOOLCHAIN=local ./scripts/check.sh`
+- `GOTOOLCHAIN=local GOPROXY=off go test -race ./...`
+- `git diff --check`
+
+No environmental limitation affected validation; checks ran on Linux/amd64.
+
 ## Stage 13 — Add maintained adoption examples
 
 1. Add a small executable example showing if-present and required adoption with