fix(pi): make watcher wake delivery durable

[ruby-dlee]

Intent

Make Pi follow-up supervision continuously self-rearm across actionable exits and retry wake delivery until observably admitted, preserving direct captain input priority. Fix the asynchronous duplicate-admission race: mark each fire-and-forget handoff pending before calling Pi, never retry while asynchronous admission remains possible, and retry only after the concrete agent_settled non-admission boundary or synchronous caller failure. Executable coverage must prove delayed admission after the former retry timer remains exactly once, settlement without admission retries with one stable delivery identity, two consecutive wakes retain distinct identities and live successors, and direct input/image continuity, ownership stops, and cleanup remain intact. Keep validation bounded to the focused deterministic, exact installed-Pi, continuity, guard, lint, and isolated Pi 0.84.2 live proofs already established; skip unrelated repository-wide local test and lint pipeline steps. Continue through exact-head review, push, PR, and green CI without approving or skipping findings.

What Changed

• Keep Pi watcher supervision continuously armed by starting successor watchers after actionable exits and stopping cleanly on away mode, ownership loss, or shutdown.
• Track wake admission before asynchronous handoff, suppress premature duplicates, and retry non-admitted deliveries with a stable identity after settlement or synchronous failure.
• Expand deterministic and live Pi coverage for delayed admission, consecutive wakes, direct input/image continuity, ownership transitions, and cleanup, with matching protocol documentation.

Risk Assessment

⚠️ Medium: The change is focused and includes behavioral coverage for the new Pi wake/rearm lifecycle, but it touches asynchronous supervision, process ownership, and delivery retry state where runtime ordering assumptions remain inherently delicate.

Testing

• ⏭️ Test - skipped

Pipeline

Updates from git push no-mistakes

✅ **intent** - passed

✅ No issues found.

✅ **Rebase** - passed

✅ No issues found.

⚠️ **Review** - medium risk

✅ No issues found.

⏭️ **Test** - skipped

Step was skipped.

✅ **Document** - passed

✅ No issues found.

⏭️ **Lint** - skipped

Step was skipped.

✅ **Push** - passed

✅ No issues found.