feat: add Pi package workspace

Author: HenryQW

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - run: npm ci
+      - run: npm test
+      - run: npm run typecheck
+      - run: npm run pack:check

.gitignore

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+node_modules/
+coverage/
+.npm/
+*.tgz
+npm-debug.log*
+.env
+.env.*
+.DS_Store

README.md

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+# HenryQW Pi packages
+
+Public Pi packages under `@henryqw` scope.
+
+## Packages
+
+| Package | Install | Purpose |
+| --- | --- | --- |
+| [`@henryqw/pi-auto-compact`](./packages/pi-auto-compact) | `pi install npm:@henryqw/pi-auto-compact` | Compact context at 50% and resume current task. |
+
+## Development
+
+Requires Node.js `>=22.19.0`.
+
+```bash
+npm ci
+npm test
+npm run typecheck
+npm run pack:check
+```
+
+Run live Pi integration tests only when authenticated model access is available:
+
+```bash
+npm run test:live
+```
+
+Live tests use real model requests and can incur provider cost. They set a temporary small context window so compaction completes quickly.
+
+## Release
+
+See [`docs/releasing.md`](./docs/releasing.md). Each package publishes independently; package names use `@henryqw` scope.
+
+## Install a package
+
+```bash
+pi install npm:@henryqw/pi-auto-compact
+```

docs/releasing.md

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+# Release packages
+
+Run from repository root.
+
+1. Update package version:
+
+   ```bash
+   npm version patch --workspace packages/pi-auto-compact
+   ```
+
+2. Run checks:
+
+   ```bash
+   npm test
+   npm run typecheck
+   npm run pack:check
+   npm run test:live
+   ```
+
+3. Publish package:
+
+   ```bash
+   npm publish --workspace @henryqw/pi-auto-compact --access public
+   ```
+
+4. Push commit and tag created by `npm version`:
+
+   ```bash
+   git push --follow-tags origin main
+   ```
+
+Do not publish without a version change. Keep package scope `@henryqw` for every future Pi package.