Add archive promotion locks

docs/config.md

@@ -154,6 +154,9 @@ archive:
     - source: narratio.artifact.session_recap
       dest: artifacts/session_recap.md
       required: true
+  locks:
+    - source: narratio.artifact.session_recap
+      reason: Final recap was manually edited.
 
 whisperx:
   transcribe_url: "https://transcription.example.com/transcribe"
@@ -177,6 +180,7 @@ Operational notes:
 
 - archive promotion is explicit and source-based via `archive.promote_artifacts`.
 - `source` is required; `dest` is optional and derived when omitted.
+- `archive.locks` skips top-level promotion overwrites for locked sources while preserving run-local uploads.
 - Narratio does not auto-promote all generated analyze artifacts.
 - `restore` reads the same config/campaign/session inputs and restore scope is bounded by committed archive current state.
 
@@ -205,6 +209,9 @@ Operational notes:
 | `pipeline.archive.promote_artifacts[].source` | string | Yes (per rule) | none |
 | `pipeline.archive.promote_artifacts[].dest` | string | No | derived from source |
 | `pipeline.archive.promote_artifacts[].required` | bool | No | `true` |
+| `pipeline.archive.locks[]` | list | No | empty |
+| `pipeline.archive.locks[].source` | string | Yes (per lock) | none |
+| `pipeline.archive.locks[].reason` | string | No | empty |
 | `pipeline.whisperx.transcribe_url` | string | Yes | none |
 | `pipeline.whisperx.language` | string | No | `en` |
 | `pipeline.whisperx.timeout` | duration string | No | `30m` |
@@ -305,6 +312,8 @@ Allowed `pipeline.scriptorium.artifacts.<name>.inputs.<key>.source` values:
 - `narratio.bounds.session`
 - `narratio.artifact.<configured_artifact_key>`
 
+`pipeline.archive.locks[].source` accepts the same source values as `pipeline.archive.promote_artifacts[].source`.
+
 Archive promotion destination rules:
 
 - `dest` must be a clean relative path (not absolute, no traversal).
@@ -314,6 +323,14 @@ Archive promotion destination rules:
   - configured sources derive from `pipeline.scriptorium.artifacts.<name>.output_path`;
   - derivation failure is a config validation error.
 
+Archive lock rules:
+
+- locks are source-based and do not accept `dest`.
+- duplicate lock sources are rejected.
+- locked promotions are recorded as intentional skips in archive metadata.
+- locked required promotions do not fail archive by default.
+- ordinary `--force` reruns do not override locks.
+
 Restore-related implications:
 
 - restore remote identity requires archive S3 identity to resolve (`pipeline.storage.s3.bucket` and session prefix derivation inputs).