Promote current session artifacts to storage

architecture.md

@@ -40,7 +40,6 @@ Implemented:
 
 Still placeholder/future:
 
-- archive-stage promotion behavior
 - `notify` stage behavior
 - additional Scriptorium artifact types beyond `session_recap`
 - artifact-to-artifact workflows beyond the initial single-artifact implementation
@@ -168,7 +167,7 @@ Remote object-store backend scope:
   - backend methods do not prepend `root_prefix` or infer campaign/session/run paths
 - `prepare` now uses object-store `List` and `Download` for S3 audio input
 - `archive` now uses object-store `Upload` for successful run-record upload under the run prefix
-- archive promotion behavior using top-level writes and current pointers remains future work
+- `archive` now uses object-store `Upload` for promoted outputs and current pointers
 
 Prepare S3 audio behavior (implemented):
 
@@ -183,7 +182,7 @@ Prepare S3 audio behavior (implemented):
 - record S3 provenance in manifest input records (bucket/key/metadata/local paths/checksum)
 - no AWS SDK types are used in stage code; storage implementation details stay in storage adapter packages
 
-Archive run upload behavior (implemented):
+Archive publishing behavior (implemented):
 
 - `archive` verifies prerequisite stage success before upload:
   - `prepare`, `transcribe`, `merge`, `polish`, `normalize`, `trim`, `analyze`
@@ -196,11 +195,22 @@ Archive run upload behavior (implemented):
 - file upload order is deterministic (sorted relative paths)
 - `archive.enabled: false` and `archive.upload_run: false` skip upload cleanly
 - stage metadata records non-secret upload context:
-  - `s3_bucket`, `s3_run_prefix`, `files_uploaded`, `uploaded_paths`, `audio_upload_skipped`
-- archive does not yet:
-  - write top-level promoted outputs
-  - write `current/manifest.json`
-  - write `current/run_id.txt`
+  - run upload details, promoted output details, current manifest key, current pointer key
+  - no secrets, transcript contents, prompt contents, or environment dumps
+- promotion rules:
+  - `from` resolves from local workdir
+  - `to` resolves under session-level S3 root
+  - missing required source fails archive
+  - missing optional source is skipped and recorded
+- default promoted outputs:
+  - `transcripts/trimmed.json`
+  - `artifacts/session_recap.md`
+- current pointers:
+  - `current/manifest.json` uploaded after run upload and promotions
+  - `current/run_id.txt` uploaded last with `{run_id}\n`
+  - `current/run_id.txt` is the effective commit marker
+- if promotion or current-manifest upload fails, archive returns failure and does not write `current/run_id.txt`
+- failed/incomplete runs remain local and are not uploaded
 
 `pipeline.scriptorium` is optional. Existing pipelines without Scriptorium continue to work.