Add archive storage path configuration

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

@@ -79,6 +79,32 @@ current/run_id.txt:
   written last as the effective S3 commit pointer
 ```
 
+### 2.1 Implementation Status (2026-05-16)
+
+Implemented in repository:
+
+- storage/archive configuration and validation foundations:
+  - `storage.s3`
+  - `spool`
+  - `archive`
+  - promotion-rule safety checks
+  - `inputs.audio_s3` modeling
+- run and path-model foundations:
+  - run ID generation (`YYYYMMDDTHHMMSSZ-xxxxxxxx`)
+  - S3 key builders for session/run/current/promoted destinations
+  - campaign/session/run local work and spool path helpers
+  - manifest run/path identity fields
+- examples and tests for the above foundations
+
+Not implemented yet:
+
+- real S3 backend
+- AWS SDK integration
+- prepare-stage S3 list/download behavior
+- archive-stage S3 upload behavior
+- promotion uploads
+- writing `current/manifest.json` and `current/run_id.txt` to S3
+
 ## 3. S3 Layout
 
 The canonical S3 layout should be:
@@ -801,9 +827,9 @@ Test:
 - `run-stage` can find or require a run ID according to final CLI policy
 - multiple local runs are handled deterministically
 
-## 15. Implementation Phases
+## 15. Implementation Sequence
 
-### Phase 1: Config and Path Model
+### Config and Path Model (Implemented)
 
 Implement:
 
@@ -823,7 +849,7 @@ Expected commit:
 Add archive storage path configuration
 ```
 
-### Phase 2: Storage Backend Interface and S3 Backend
+### Storage Backend Interface and S3 Backend
 
 Implement:
 
@@ -841,7 +867,7 @@ Expected commit:
 Add S3 storage backend abstraction
 ```
 
-### Phase 3: Prepare Stage S3 Audio Download
+### Prepare Stage S3 Audio Download
 
 Implement:
 
@@ -858,7 +884,7 @@ Expected commit:
 Download S3 audio during prepare"
 ```
 
-### Phase 4: Real Archive Stage Run Upload
+### Real Archive Stage Run Upload
 
 Implement:
 
@@ -873,7 +899,7 @@ Expected commit:
 Upload successful run records to S3
 ```
 
-### Phase 5: Promotion Rules and Current Pointer
+### Promotion Rules and Current Pointer
 
 Implement:
 
@@ -890,7 +916,7 @@ Expected commit:
 Promote current session artifacts to S3
 ```
 
-### Phase 6: Documentation and Examples
+### Documentation and Examples
 
 Update:
 
@@ -907,7 +933,7 @@ Expected commit:
 Document S3 archive workflow
 ```
 
-### Phase 7: Architectural Review
+### Architectural Review
 
 Review: