Add 5 pi extensions: pi-subagents, pi-crew, rpiv-pi, pi-interactive-shell, pi-intercom

extensions/pi-crew/skills/pi-extension-lifecycle/SKILL.md

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+---
+name: pi-extension-lifecycle
+description: Pi extension lifecycle and registration patterns. Use when adding or reviewing extension tools, commands, resources, providers, event handlers, session hooks, or context-sensitive Pi API usage.
+---
+
+# pi-extension-lifecycle
+
+Use this skill when working on Pi extension registration or lifecycle behavior.
+
+## Source patterns distilled
+
+- Pi core: `source/pi-mono/packages/coding-agent/src/core/extensions/types.ts`, `loader.ts`, `runner.ts`
+- Pi examples: `source/pi-mono/packages/coding-agent/examples/extensions/`
+- pi-crew extension entry: `src/extension/register.ts`, `src/extension/registration/*.ts`
+
+## Rules
+
+- Register tools, commands, shortcuts, widgets, providers, and event handlers from the extension factory or lifecycle callbacks.
+- Tool definitions should use a TypeBox schema and an `execute(toolCallId, params, signal, onUpdate, ctx)` handler.
+- Use fresh `ExtensionContext`/`ExtensionCommandContext` after session replacement (`newSession`, `fork`, `switchSession`, `reload`). Do not retain old context references for later work.
+- For session-scoped work, derive session identity from `ctx.sessionManager.getSessionId()` and pass it into pi-crew `TeamContext`.
+- Prefer small registration modules under `src/extension/registration/`; keep `index.ts` minimal.
+- Clean up intervals, event subscriptions, child processes, and watchers on session switch/shutdown.
+- Wrap optional Pi API hooks in compatibility checks/try-catch when supporting older Pi versions.
+
+## Anti-patterns
+
+- Do not use stale context objects after session switch.
+- Do not register duplicate tool/command names and assume override behavior.
+- Do not perform blocking filesystem or network work inside extension render callbacks.
+- Do not add hardcoded global keybindings without config or collision review.
+
+## Verification
+
+```bash
+cd pi-crew
+npx tsc --noEmit
+npm test
+```