Refine documentation roadmap and record implementation validation

docs/roadmap/documentation.md

@@ -466,12 +466,19 @@ without privacy and size review.
 
 ### Stage 1: Write Documentation Roadmap
 
-- Goal: create this roadmap.
-- Files: `docs/roadmap/documentation.md`.
-- Repository areas to inspect: documentation policy, architecture policy,
-  README, root `architecture.md`, CLI/config/pipeline/schema/report/tests.
-- Acceptance criteria: roadmap exists, no other files changed by this stage,
-  and the roadmap is action-oriented.
+- Goal: review and finalize this roadmap as the implementation plan for the
+  documentation migration.
+- Files: `docs/roadmap/documentation.md` only.
+- Repository areas inspected: documentation policy, architecture policy,
+  `README.md`, root `architecture.md`, and CLI/config/pipeline/schema/report
+  code and tests.
+- Completion status: complete (2026-05-24).
+- Completion evidence:
+  - `go test ./...` passed.
+  - `git status --short` confirmed no unrelated working-tree changes before
+    roadmap-only edits.
+- Acceptance criteria: roadmap is present, action-oriented, and constrained to
+  implemented behavior outside `docs/roadmap/`.
 - Suggested validation commands: `go test ./...`; `git status --short`.
 - Prompt size: one implementation prompt.