Add happy-cli CI workflow and fix MCP OAuth discovery

- Add build-cli.yml workflow to build and publish happy-cli to GitHub Packages
- Fix MCP server: return 404 for .well-known paths (Claude Code OAuth discovery)
- Fix TS type error in runAcp.ts (null vs undefined)

Author: Farewell

.github/workflows/build-cli.yml

@@ -0,0 +1,51 @@
+name: Build & Publish Happy CLI
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'packages/happy-cli/**'
+      - 'packages/happy-wire/**'
+      - '.github/workflows/build-cli.yml'
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          registry-url: https://npm.pkg.github.com
+          scope: '@farewellsagittarius'
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile --ignore-engines --network-timeout 600000
+
+      - name: Build happy-wire
+        run: yarn workspace @slopus/happy-wire build
+
+      - name: Build happy-cli
+        run: yarn workspace happy-coder build
+
+      - name: Publish to GitHub Packages
+        working-directory: packages/happy-cli
+        run: |
+          # Scope the package to the repo owner for GitHub Packages
+          node -e "
+            const pkg = require('./package.json');
+            pkg.name = '@farewellsagittarius/happy-coder';
+            pkg.publishConfig = { registry: 'https://npm.pkg.github.com' };
+            require('fs').writeFileSync('./package.json', JSON.stringify(pkg, null, 2));
+          "
+          npm publish || echo "Version already published, skipping"
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

packages/happy-cli/src/agent/acp/runAcp.ts

@@ -745,7 +745,7 @@ export async function runAcp(opts: {
         if (verbose) {
           logAcp('muted', `Outgoing modes from ${opts.agentName} (${modes.availableModes.length}), current=${modes.currentModeId}:`);
           for (const mode of modes.availableModes) {
-            logAcp('muted', `  mode=${mode.id} name=${mode.name}${formatOptionalDetail(mode.description, 160)}`);
+            logAcp('muted', `  mode=${mode.id} name=${mode.name}${formatOptionalDetail(mode.description ?? undefined, 160)}`);
           }
         }
         session.updateMetadata((currentMetadata) =>

packages/happy-cli/src/claude/utils/startHappyServer.ts

@@ -87,6 +87,11 @@ export async function startHappyServer(client: ApiSessionClient) {
 
     const server = createServer(async (req, res) => {
         try {
+            const url = req.url || '';
+            if (url.startsWith('/.well-known/')) {
+                res.writeHead(404).end();
+                return;
+            }
             await transport.handleRequest(req, res);
         } catch (error) {
             logger.debug("Error handling request:", error);