feat(hooks): add Pi extension target

[RaviTharuma]

Summary

• add export-only Pi hook support through one RuleSync-owned generated extension
• generate project .pi/extensions/rulesync-hooks.ts or global .pi/agent/extensions/rulesync-hooks.ts
• map conservative lifecycle/tool events, run command hooks with JSON stdin, support matchers and timeouts
• protect deletion with an ownership marker and leave unrelated Pi extensions untouched
• document that import and blocking/mutation semantics are not claimed

Test plan

• pnpm check
• focused Pi/processor tests
• pnpm test — 324 files, 7,276 tests passed

Closes #2319.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.

[RaviTharuma]

Closing temporarily to comply with this repository’s limit of two concurrent open PRs for external contributors. The implementation remains available on RaviTharuma:feat/pi-hooks-2319 and is linked from #2319. I will reopen this PR after one of #2320 or #2321 is merged or closed.

[RaviTharuma]

Closing as superseded by maintainer PR #2324, which implemented Pi hooks support and was merged into main. Thank you for picking this up.