Record the Narratio upgrade in progress

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Implementation Plan 0021: Adopt Narratio v3.0.0
 
-Status: ready
+Status: in_progress
 
 Target executor: GPT-5.6-Terra
 
@@ -49,6 +49,8 @@ scope, and rationale. Suite integration is not part of this plan.
 
 ## Stage 1: Migrate the Role and Existing Fixtures to the v3 Interface
 
+Completion: complete (2026-09-28).
+
 ### Required Policy Review
 
 Read workspace `AGENTS.md`, `docs/orientation.md`, `docs/conventions.md`,
@@ -253,7 +255,14 @@ begin it, publish, push, or deploy from this plan.
 
 ## Progress Notes
 
-Plan approved; implementation has not started.
+Plan approved.
+
+- Stage 1: `bash -n` and the local integration harness passed, including
+  syntax check, production-profile lint, native v3 baseline and representative
+  validation, explicit v2.1.0 selection, supplied-Go recovery, and clean
+  immediate repeats. Role and workspace `git diff --check` passed. The role
+  diff changes only the public configuration interface, README, and existing
+  fixtures; production tasks and suite pins are unchanged.
 
 ## Open Questions