Record final validation and repair audit links

docs/roadmap/implementation.md

@@ -469,6 +469,16 @@ names/claims to separate historical audit evidence from stale current guidance.
 
 ## Stage 17: Validate And Close The Sprint
 
+**Completed:** Findings 1–7 are implemented and finding 8's runtime behavior is
+preserved. With Go 1.27.3, `go test -race ./...` and `go vet ./...` passed,
+including maintained examples. All tracked Go files are formatted; full diff
+whitespace and repository hygiene checks passed. A local Markdown destination
+and heading scan checked 580 links in 63 files; 153 historical code references
+were corrected to their audit commits and verified against those Git objects.
+Remaining validating copies are confined to acceptance/overlay boundaries;
+trusted copies and transfers retain the documented ownership boundaries. No
+release, push, or publication was performed.
+
 **Scope:** combined final state, all findings and deferred checks.
 
 1. Resolve remaining deferred compilation/tests; format changed Go files. Run