Delegate analyze checkpoints to shared persistence

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implementation Plan: Shared Stage Checkpoint Mechanics
 
-Status: Implementation in progress; Stage 1 complete.
+Status: Implementation in progress; Stages 1-2 complete.
 
 ## Scope and Authority
 
@@ -193,7 +193,15 @@ stage behavior. Temporary copying overlap is removed in Stage 3.
 
 ## Stage 2: Migrate Analyze
 
-Status: Pending.
+Status: Complete.
+
+Completion marker (2026-09-22): Replaced analyze's local candidate-copy,
+save, and promotion choreography with the shared checkpoint operation while
+retaining its existing-record requirement, typed validation, path resolution,
+and post-save working and committed collection refresh. Existing recovery,
+selection, invalidation, and rollback coverage required no duplication.
+Verified with `go test ./internal/stage ./internal/app ./internal/manifest`,
+`go test -race ./internal/stage ./internal/app`, and `git diff --check`.
 
 Preparation: `internal/stage/analyze_execution_state.go`,
 `analyze_checkpoint_test.go`, `analyze_failure_test.go`,

internal/stage/analyze_execution_state.go

@@ -136,28 +136,26 @@ func (state *analyzeExecutionState) checkpointCollection(
 		return fmt.Errorf("validate analyze artifact collection: %w", err)
 	}
 
-	candidate := *m
-	candidate.Stages = make(map[string]*manifest.StageRecord, len(m.Stages))
-	for name, record := range m.Stages {
-		candidate.Stages[name] = record
-	}
-	analyzeRecord := *m.Stages["analyze"]
-	analyzeRecord.AnalyzeStateVersion = manifest.AnalyzeStateContractVersion
-	analyzeRecord.AnalyzeArtifacts = manifest.CloneAnalyzeArtifactCollection(records)
-	candidate.Stages["analyze"] = &analyzeRecord
-
 	manifestPath := artifacts.SessionManifestPathForCampaign(
 		state.execution.Paths.WorkspaceRoot,
 		m.Campaign,
 		m.SessionID,
 	)
-	if err := state.execution.Env.ManifestStore.Save(ctx, manifestPath, &candidate); err != nil {
+	if err := checkpointStageCollection(
-		return fmt.Errorf("save session manifest %q: %w", manifestPath, err)
+		ctx,
+		state.execution.Env.ManifestStore,
+		manifestPath,
+		m,
+		"analyze",
+		func(record *manifest.StageRecord) error {
+			record.AnalyzeStateVersion = manifest.AnalyzeStateContractVersion
+			record.AnalyzeArtifacts = manifest.CloneAnalyzeArtifactCollection(records)
+			return nil
+		},
+	); err != nil {
+		return err
 	}
 	liveRecord := m.Stages["analyze"]
-	liveRecord.AnalyzeStateVersion = candidate.Stages["analyze"].AnalyzeStateVersion
-	liveRecord.AnalyzeArtifacts = manifest.CloneAnalyzeArtifactCollection(candidate.Stages["analyze"].AnalyzeArtifacts)
-	m.UpdatedAt = candidate.UpdatedAt
 	state.records = manifest.CloneAnalyzeArtifactCollection(liveRecord.AnalyzeArtifacts)
 	state.committedRecords = manifest.CloneAnalyzeArtifactCollection(liveRecord.AnalyzeArtifacts)
 	return nil