Document the source release workflow

docs/roadmap/implementation.md

@@ -369,7 +369,7 @@ the stage.
 
 ## Stage 5: document operation and reconcile release navigation
 
-**Status:** pending. **Prerequisite:** Stage 4.
+**Status:** complete. **Prerequisite:** Stage 4.
 
 **Files:** new `docs/release.md`; `docs/policy/release.md`, README,
 `docs/development.md`; historical roadmap references listed below; and stage
@@ -444,6 +444,18 @@ licensing footer navigation, intended release URL paths, changed historical
 references, provenance, and Markdown whitespace. No publisher invocation on
 CommandKit or another full test suite is needed for these prose edits.
 
+Observed 2026-10-08: added `docs/release.md` with source-only preparation,
+publication, status, and exact-object recovery instructions. The runbook was
+reviewed against the profile, launcher, release policy, OSS policy, and ReleaseKit
+v0.2.0 references. The policy retains its base version and upstream provenance
+with an updated local date. README and developer navigation link to the runbook;
+the developer guide records the optional local exercise. Historical references
+now use the immutable initial-plan snapshot, while current ReleaseKit work links
+to its roadmap and this plan. A link check found 228 valid local destinations and
+fragments across 11 affected documents; Markdown whitespace checks passed. The
+README's licensing and attribution footer remains intact. No real publication
+or full test suite was run for this prose stage.
+
 **Completion:** implemented tooling has one canonical runbook, policy status is
 accurate, and old library history is distinguishable from current ReleaseKit
 work. Commit the stage.