Record D&D storage and publishing implementation

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implementation Plan 0015: Enable D&D S3 Storage and Publishing
 
-Status: ready
+Status: in_progress
 
 Target executor: GPT-5.6-Terra
 
@@ -558,12 +558,15 @@ Commit intent: `Record D&D storage and publishing implementation`
 
 ## Progress Notes
 
-- The original plan was approved and Stage 1 began against Narratio v2.1.0.
-- Native validation exposed Narratio's publish-output atomic-sequence
-  bookkeeping defect; the implementation agent correctly stopped with its
-  partial pipeline edits uncommitted.
-- Narratio v2.1.1 at `442469b9f57e65ce17f09059609dd1a37cf8c3b6`
-  corrected the defect and added focused regression coverage without changing
-  the public configuration contract.
-- Resume Stage 1 from the preserved pipeline edits, advance the application pin
-  to v2.1.1, rerun the complete validation, and then continue in stage order.
+- Stage 1 is complete in pipeline commit
+  `51566afcf69083cdbb5b5718f2544c86b079001c`; the complete standalone suite
+  passed and the commit is present on public `origin/main`.
+- Stage 2 is complete in collection fixture commit
+  `cf3de016ee09edf91afc3bc1addfd926d4a172ad`; shell syntax and whitespace
+  validation passed.
+- Stage 3 is complete in collection merge
+  `46913446765e86ecfb29ebad9955d579ef6a4c7e` with generated squash
+  `77f67adbc0f700e88bc15554e02052eaa22f1033`; the complete assembled-artifact
+  suite passed and the history is present on public `origin/main`.
+- Stage 4 is complete in the workspace handoff commit created by this change;
+  implementation is awaiting independent review.