feat: live deployment with automated acceptance checklist (phase 13)

- APP_INTERNAL_URL: in-network base URL for §5.2 callbacks and signed
  attachment URLs handed to the external services (compose: http://app:8787)
- work-performer image runs as the node user with ~/.claude mounted into
  /home/node — the claude CLI refuses --dangerously-skip-permissions as root
- scripts/acceptance.sh: re-run-safe live verification of the §13 checklist
  (demo import within one poll, subdivide sum=1 + editable, extend sibling,
  publish/bounty math, decline/claim/approve, changes-requested loop,
  approval award in metrics, unassign, AI job through real Claude Code with
  signed idempotent callback, breaker independence between the two services)
- README/DECISIONS: sudo HOME gotcha, internal URL, non-root performer

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -26,6 +26,10 @@ docker compose --profile mocks up -d --build
 open http://localhost:8787
 ```
 
+> **Note:** if you run compose via `sudo`, use
+> `sudo --preserve-env=HOME docker compose …` — otherwise `${HOME}` resolves
+> to `/root` and the work performer mounts the wrong `~/.claude` credentials.
+
 First login: `ADMIN_EMAIL` / `ADMIN_INITIAL_PASSWORD` from `.env` — a
 password change is forced immediately.