Add Pi Research Agent package

Autonomous research agent with web search, source analysis, and report synthesis.
Built on Pi agent core. Available as CLI, programmatic API, and MCP server.

Features:
- 4 built-in tools: web_search, read_url, save_note, synthesize_report
- CLI with TUI and print modes
- Programmatic API via ResearchAgent class
- MCP server with 3 tools: research, quick_search, read_url
- Skills system for custom research behavior
- Automatic .env file loading for API keys
- Configurable max turns, output formats (markdown/JSON/bullet)
- Automatic report saving to research-output/

.github/workflows/publish.yml

@@ -0,0 +1,40 @@
+name: Publish to npm
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  publish:
+    name: Publish Package
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22.19"
+          registry-url: "https://registry.npmjs.org"
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Build dependencies
+        run: |
+          npm run build --workspace=@earendil-works/pi-ai
+          npm run build --workspace=@earendil-works/pi-tui
+          npm run build --workspace=@earendil-works/pi-agent-core
+
+      - name: Build package
+        run: npm run build --workspace=@earendil-works/pi-research-agent
+
+      - name: Publish to npm
+        run: |
+          npm publish --workspace=@earendil-works/pi-research-agent --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}