Require explicit manifest schemas

internal/manifest/run_manifest.go

@@ -41,6 +41,7 @@ type RunStageRecord struct {
 
 // RunManifest is the invocation-scoped execution record under runs/{run_id}/manifest.json.
 type RunManifest struct {
+	SchemaVersion       string                     `json:"schema_version"`
 	SessionID           string                     `json:"session_id"`
 	Campaign            string                     `json:"campaign,omitempty"`
 	RunID               string                     `json:"run_id"`
@@ -66,6 +67,7 @@ type RunManifest struct {
 // NewRun constructs a new run manifest with deterministic timestamps.
 func NewRun(sessionID, campaign, runID string, force bool, requestedStages []string, now time.Time) *RunManifest {
 	return &RunManifest{
+		SchemaVersion:   RunManifestSchemaVersion,
 		SessionID:       strings.TrimSpace(sessionID),
 		Campaign:        strings.TrimSpace(campaign),
 		RunID:           strings.TrimSpace(runID),
@@ -156,6 +158,10 @@ func (m *RunManifest) ensureStage(name string, at time.Time) *RunStageRecord {
 			CreatedAt: at,
 			UpdatedAt: at,
 		}
+		if stageName == "analyze" {
+			s.AnalyzeStateVersion = AnalyzeStateContractVersion
+			s.AnalyzeArtifacts = map[string]AnalyzeArtifactRecord{}
+		}
 		m.Stages[stageName] = s
 	}
 	if s.Name == "" {