The Socket Mode inbound listener crashed at registration time on first live
run: `@app.action({})` raised `BoltError: action ({}) must be any of str,
Pattern, and dict` under slack_bolt 1.28.0, killing the listener thread (the
whole inbound answer path — message/app_mention/block_actions — went down,
caught only by the coordinator's respawn watchdog). serve() is marked
`# pragma: no cover - live socket`, so this was never exercised until the R720
bring-up. Replace the unsupported empty-dict matcher with a catch-all
`re.compile(r".*")` action_id regex; handle_event still does the real filtering
+ AUTHZ-01 owner-allowlist gate, so over-matching is safe.
Verified on sh-secrev: listener connects (live Socket Mode WebSocket), outbound
chat.postMessage works, 0 errors. /sh-security-review PASS (no confirmed
critical/high; matcher change introduces no new findings).
Also adds the dedicated Slack app (manifest + README) backing the clarifier
gate — "Sea Haven agent-team" (A0BC7AT8NUD), workspace-scoped install to avoid
the Enterprise-Grid `scope_not_allowed_on_enterprise` org-install trap — and
patches the provisioning runbook's stale langgraph pin (1.1.10 -> 1.2.5).
