Add post-archive cleanup policies

docs/archive-storage.md

@@ -20,11 +20,13 @@ Implemented:
 - archive uploads configured promoted outputs to session-level keys.
 - archive uploads `current/manifest.json`.
 - archive uploads `current/run_id.txt` last as the effective commit marker.
+- optional post-archive local cleanup:
+  - `pipeline.spool.delete_audio_after_archive: true` removes only the run-scoped spool audio directory
+  - `pipeline.workspace.cleanup_after_archive: true` removes only the run-scoped local workdir
 - tests use fake storage and do not require live S3.
 
 Future work:
 
-- spool audio cleanup/deletion behavior
 - `notify` stage behavior
 - stale detection
 - optional future source-audio upload mode
@@ -89,6 +91,7 @@ Archive writes:
 Writing `current/run_id.txt` last makes it the effective commit marker for published session state.
 
 If any required run upload, promotion upload, or current-manifest upload fails, archive returns failure and does not write `current/run_id.txt`.
+Cleanup runs only after this commit-marker write has succeeded.
 
 ## Audio Upload Policy
 
@@ -99,6 +102,7 @@ Original audio is expected at the session-level audio prefix and is not duplicat
 
 - `archive.enabled: false` skips archive cleanly.
 - `archive.upload_run: false` skips run upload cleanly.
+- both skip cases also skip post-archive local cleanup.
 
 ## Metadata