ci: Add GitHub Actions workflow for automated testing

- Runs lint, typecheck, test, and build on push/PR to main
- Validates plugin structure (plugin.json, hooks.json, scripts)
- Uses Bun for fast CI execution

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,61 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        working-directory: tui
+        run: bun install
+
+      - name: Lint
+        working-directory: tui
+        run: bun run lint
+
+      - name: Type check
+        working-directory: tui
+        run: bun run typecheck
+
+      - name: Test
+        working-directory: tui
+        run: bun test
+
+      - name: Build
+        working-directory: tui
+        run: bun run build
+
+  validate-plugin:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check plugin.json exists
+        run: test -f .claude-plugin/plugin.json
+
+      - name: Check hooks.json exists
+        run: test -f hooks/hooks.json
+
+      - name: Check scripts are executable
+        run: |
+          test -x scripts/session-start.sh
+          test -x scripts/capture-event.sh
+          test -x scripts/cleanup.sh
+
+      - name: Validate JSON files
+        run: |
+          jq . .claude-plugin/plugin.json > /dev/null
+          jq . hooks/hooks.json > /dev/null