diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
new file mode 100644
index 00000000..a45f392e
--- /dev/null
+++ b/.github/workflows/pr.yml
@@ -0,0 +1,186 @@
+name: PR
+
+on:
+  pull_request:
+    branches:
+      - master
+
+concurrency:
+  group: pr-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  policy:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Block manual lockfile edits
+        if: github.head_ref != 'chore/refresh-lockfile'
+        run: |
+          changed="$(git diff --name-only "${{ github.event.pull_request.base.sha }}" "${{ github.event.pull_request.head.sha }}")"
+          if printf '%s\n' "$changed" | grep -qx 'pnpm-lock.yaml'; then
+            echo "Do not commit pnpm-lock.yaml in pull requests. CI owns lockfile updates."
+            exit 1
+          fi
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9.15.4
+          run_install: false
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24
+
+      - name: Validate Dockerfile deps stage
+        run: |
+          missing=0
+
+          # Extract only the deps stage from the Dockerfile
+          deps_stage="$(awk '/^FROM .* AS deps$/{found=1; next} found && /^FROM /{exit} found{print}' Dockerfile)"
+
+          if [ -z "$deps_stage" ]; then
+            echo "::error::Could not extract deps stage from Dockerfile (expected 'FROM ... AS deps')"
+            exit 1
+          fi
+
+          # Derive workspace search roots from pnpm-workspace.yaml (exclude dev-only packages)
+          search_roots="$(grep '^ *- ' pnpm-workspace.yaml | sed 's/^ *- //' | sed 's/\*$//' | grep -v 'examples' | grep -v 'create-paperclip-plugin' | tr '\n' ' ')"
+
+          if [ -z "$search_roots" ]; then
+            echo "::error::Could not derive workspace roots from pnpm-workspace.yaml"
+            exit 1
+          fi
+
+          # Check all workspace package.json files are copied in the deps stage
+          for pkg in $(find $search_roots -maxdepth 2 -name package.json -not -path '*/examples/*' -not -path '*/create-paperclip-plugin/*' -not -path '*/node_modules/*' 2>/dev/null | sort -u); do
+            dir="$(dirname "$pkg")"
+            if ! echo "$deps_stage" | grep -q "^COPY ${dir}/package.json"; then
+              echo "::error::Dockerfile deps stage missing: COPY ${pkg} ${dir}/"
+              missing=1
+            fi
+          done
+
+          # Check patches directory is copied if it exists
+          if [ -d patches ] && ! echo "$deps_stage" | grep -q '^COPY patches/'; then
+            echo "::error::Dockerfile deps stage missing: COPY patches/ patches/"
+            missing=1
+          fi
+
+          if [ "$missing" -eq 1 ]; then
+            echo "Dockerfile deps stage is out of sync. Update it to include the missing files."
+            exit 1
+          fi
+
+      - name: Validate dependency resolution when manifests change
+        run: |
+          changed="$(git diff --name-only "${{ github.event.pull_request.base.sha }}" "${{ github.event.pull_request.head.sha }}")"
+          manifest_pattern='(^|/)package\.json$|^pnpm-workspace\.yaml$|^\.npmrc$|^pnpmfile\.(cjs|js|mjs)$'
+          if printf '%s\n' "$changed" | grep -Eq "$manifest_pattern"; then
+            pnpm install --lockfile-only --ignore-scripts --no-frozen-lockfile
+          fi
+
+  verify:
+    needs: [policy]
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9.15.4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Typecheck
+        run: pnpm -r typecheck
+
+      - name: Run tests
+        run: pnpm test:run
+
+      - name: Build
+        run: pnpm build
+
+      - name: Release canary dry run
+        run: |
+          git checkout -B master HEAD
+          git checkout -- pnpm-lock.yaml
+          ./scripts/release.sh canary --skip-verify --dry-run
+
+  e2e:
+    needs: [policy]
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9.15.4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build
+        run: pnpm build
+
+      - name: Install Playwright
+        run: npx playwright install --with-deps chromium
+
+      - name: Generate Paperclip config
+        run: |
+          mkdir -p ~/.paperclip/instances/default
+          cat > ~/.paperclip/instances/default/config.json << 'CONF'
+          {
+            "$meta": { "version": 1, "updatedAt": "2026-01-01T00:00:00.000Z", "source": "onboard" },
+            "database": { "mode": "embedded-postgres" },
+            "logging": { "mode": "file" },
+            "server": { "deploymentMode": "local_trusted", "host": "127.0.0.1", "port": 3100 },
+            "auth": { "baseUrlMode": "auto" },
+            "storage": { "provider": "local_disk" },
+            "secrets": { "provider": "local_encrypted", "strictMode": false }
+          }
+          CONF
+
+      - name: Run e2e tests
+        env:
+          PAPERCLIP_E2E_SKIP_LLM: "true"
+        run: pnpm run test:e2e
+
+      - name: Upload Playwright report
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: playwright-report
+          path: |
+            tests/e2e/playwright-report/
+            tests/e2e/test-results/
+          retention-days: 14