docs(release): record the final commit hash in the demo-release summary

artifacts/demo-release/final-summary.md

@@ -8,9 +8,10 @@
   to `main`; no rebase/reset/squash/force-push; full git history preserved, as required)
 - **Start commit** (functional-completion baseline, already accepted):
   `e0c7ed60112510687627d20a957af91c8b9db7f8`
-- **Final commit**: see `git log -1` on this branch — this file's own commit necessarily
-  cannot self-reference its own hash; the immediately following commit records it
-  explicitly for a stable, unambiguous reference.
+- **Final commit**: `294a8176d196e42408c4e99c29ab142771fcec04` (the commit that added this
+  file; a small follow-up commit records this hash explicitly, since a commit cannot
+  self-reference its own hash — `git log -1` on this branch is the authoritative source
+  if it has moved further since).
 - **Live URL**: `http://192.168.10.150:1236`
 
 ## Demo organisation and context