feat(cli): add npm publish workflow and CLI tests

Add .github/workflows/publish-cli.yml for publishing the CLI to npm on
release or via manual workflow_dispatch with dry-run support.

Add comprehensive test coverage for the CLI:
- input-mapper.test.ts: 16 tests covering argument mapping, boolean
  conversion, yargs internal property filtering, and Cli.options population
- commands.test.ts: 26 tests verifying command exports, builder flags,
  default values, and camelCase aliases for all six commands
- cli-integration.test.ts: 8 integration tests spawning the CLI process
  to verify help output, version info, and error handling

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/publish-cli.yml

@@ -0,0 +1,57 @@
+name: Publish CLI
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+    inputs:
+      dry-run:
+        description: 'Dry run (no actual publish)'
+        required: false
+        default: 'true'
+        type: boolean
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  publish:
+    name: Publish to npm
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Build
+        run: yarn build
+
+      - name: Run tests
+        run: yarn test
+
+      - name: Verify CLI
+        run: |
+          node lib/cli.js version
+          node lib/cli.js --help
+
+      - name: Publish (dry run)
+        if: github.event_name == 'workflow_dispatch' && inputs.dry-run == 'true'
+        run: npm publish --dry-run
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      - name: Publish
+        if: github.event_name == 'release' || (github.event_name == 'workflow_dispatch' && inputs.dry-run == 'false')
+        run: npm publish --provenance --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}