Promote current session artifacts to storage

docs/roadmap/narratio-s3-archive-implementation-plan.md

@@ -107,11 +107,22 @@ Implemented in repository:
   - local audio is not uploaded by default
   - upload uses storage backend abstraction and deterministic ordering
   - archive skips cleanly when `archive.enabled` or `archive.upload_run` is false
+- archive promotion and current publish behavior:
+  - promotion rules upload configured outputs to session-level destinations
+  - required missing promotion sources fail archive
+  - optional missing promotion sources are skipped and recorded
+  - `current/manifest.json` is uploaded after run upload and promotions
+  - `current/run_id.txt` is uploaded last as the effective commit marker
+  - current pointer content is `{run_id}` plus trailing newline
+  - if promotion/current manifest upload fails, current pointer is not written
 
 Not implemented yet:
 
-- promotion uploads
-- writing `current/manifest.json` and `current/run_id.txt` to S3
+- spool audio cleanup / deletion behavior
+- `notify` stage behavior
+- generic stale detection based on input/config checksums
+- optional future mode for uploading source audio from local workspace/spool
+- additional artifact generation beyond current implemented set
 
 ## 3. S3 Layout