Graph Indexer packaging (Runtime & Signals 140.A)

Deployment overlays

Helm/Compose should expose two timers for analytics: GRAPH_ANALYTICS_CLUSTER_INTERVAL and GRAPH_ANALYTICS_CENTRALITY_INTERVAL (ISO-8601 duration, default 5m). Map to GraphAnalyticsOptions.
Change-stream/backfill worker toggles via GRAPH_CHANGE_POLL_INTERVAL, GRAPH_BACKFILL_INTERVAL, GRAPH_CHANGE_MAX_RETRIES, GRAPH_CHANGE_RETRY_BACKOFF.
Storage: current build uses in-memory graph storage. GRAPH_STORAGE_CONNECTION configures the PostgreSQL-backed provider.

Cluster/centrality overlays are exportable alongside nodes.jsonl/edges.jsonl; keep under artifacts/graph-snapshots/{snapshotId}/overlays/ for air-gapped imports.
Seed bundle layout:
- clusters.ndjson — overlay records (one per node) matching graph_cluster_overlays schema.
- centrality.ndjson — overlay records with degree/betweenness.
- manifest.json — references snapshot manifest hash and run timestamps.
Determinism: overlays ordered by node_id (ordinal) to keep bundle hashes stable.

Metrics (Meter StellaOps.Graph.Indexer):
- graph_analytics_runs_total, graph_analytics_failures_total, graph_analytics_duration_seconds, graph_analytics_clusters_total, graph_analytics_centrality_total.
- graph_changes_total, graph_backfill_total, graph_change_failures_total, graph_change_lag_seconds.
Recommended alerts: lag > 5m, failures > 0 over 10m window, cluster job duration > 2m.

Cluster/centrality intervals: 5 minutes; label-propagation iterations: 6; betweenness sample size: 12.
Change stream: poll every 5s, backfill every 15m, max retries 3 with 3s backoff, batch size 256.
Overlay exports: clusters/centrality written to overlays/clusters.ndjson and overlays/centrality.ndjson with manifest; ordered by node_id for deterministic bundle hashes.

Analytics writes are idempotent (upserts keyed on tenant+snapshot+node_id). Change-stream processing is idempotent via sequence tokens persisted in the in-memory IIdempotencyStore until a durable store is delivered.
Keep Helm/Compose values in sync with these defaults when publishing the Runtime & Signals 140.A bundle.