Update pi-subagents fork to upstream v0.12.0

[nodnarbnitram]

Summary

• Update @weshipwork/pi-subagents from upstream @tintinweb/pi-subagents v0.10.3 to v0.12.0.
• Preserve the WeShip.work package identity and Mirror mode observation seam for @weshipwork/pi-herd.
• Publish fork metadata as 0.12.0-mirror.0 and document the tracked upstream tag in README.mirror.md.
• Update non-fork packages @weshipwork/pi-herd and @weshipwork/pi-herdr to validate against Pi 0.80.2 dev dependencies.

Validation

• pnpm --filter @weshipwork/pi-subagents lint
• pnpm --filter @weshipwork/pi-subagents test:mirror
• pnpm --filter @weshipwork/pi-subagents check
• pnpm --filter @weshipwork/pi-herdr check
• pnpm --filter @weshipwork/pi-herd check
• pnpm check

[greptile-apps]

Greptile Summary

This PR updates the pi-subagents fork to the upstream v0.12.0 line. The main changes are:

• Bumps the fork package version and Pi dev dependencies.
• Adds upstream FleetView UI behavior and settings wiring.
• Adds persisted subagent session frontmatter support.
• Adds foreground completion events and transcript output logging.
• Updates mirror README and package documentation for the new fork release.

Confidence Score: 4/5

This is close, but the session-switch cleanup should be fixed before merging.

• Old completion notification timers can survive a session switch.
• Group completion timers can also deliver old results after the new session is active.
• The result preservation path works for unread records, but follow-up delivery is not bounded to the original session.

packages/pi-subagents/src/index.ts

Important Files Changed

Filename	Overview
packages/pi-subagents/src/index.ts	Adds FleetView wiring and changes session transition cleanup, but old completion notification state can still cross into a new session.
packages/pi-subagents/src/agent-manager.ts	Adds foreground completion callbacks, output setup hooks, and unread-result preservation for session transitions.
packages/pi-subagents/src/ui/fleet-list.ts	Adds the below-editor FleetView navigation UI for running and recently finished subagents.

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
packages/pi-subagents/src/index.ts:481-482
**Session Timers Survive** When an agent completes just before a session switch, `clearCompleted(true)` keeps the unread old record but this handler leaves the pending notification timers and group-join timers active. Those timers can fire after the new session is active and call `pi.sendMessage` with `deliverAs: "followUp"`, so an old subagent result can still trigger a turn in the new conversation. The session boundary needs to cancel or session-scope follow-up delivery for old work while keeping the result readable through `get_subagent_result`.

_{Reviews (5): Last reviewed commit: "Revert "Cancel pending subagent nudges o..." | Re-trigger Greptile}