Integrate transcription checkpoints across lifecycle

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implementation Plan: Speaker Checkpoints and Replayable Uploads
 
-Status: Implementation in progress; Stages 1-3 complete.
+Status: Implementation in progress; Stages 1-4 complete.
 
 ## Scope and Instructions
 
@@ -241,7 +241,18 @@ ordinary, concurrent, canceled, and forced execution.
 
 ## Stage 4: Verify Runner, Merge, and Durable Lifecycle Integration
 
-Status: Pending.
+Status: Complete.
+
+Completion marker (2026-09-22): Added real-persistence application coverage for
+cross-invocation retry, interrupted running state, failed aggregate saves,
+force/reset persistence, downstream invalidation, and one-time legacy upgrade.
+Versioned merge input discovery now requires aggregate success and an exact
+match between current speaker evidence and declared aggregate outputs, while
+legacy/manual directory fallback remains available. Restore coverage preserves
+session-relative speaker paths, leaves unpublished raw transcripts absent, and
+canonical transcripts remain reusable after run-directory cleanup. Verified
+with `go test ./internal/app ./internal/stage ./internal/manifest`,
+`go test -race ./internal/app`, and `git diff --check`.
 
 Preparation: `internal/app/runner.go`, `runner_runtime.go`,
 `analyze_checkpoint_recovery_test.go`, `runner_terminal_failure_test.go`,