Add Claude Code workflow for AI-assisted PR reviews

.github/workflows/claude-code.yml

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+name: Claude Code
+
+# AI-assisted PR reviews and interactive @claude mentions.
+#
+# The actual Claude Code execution runs in eng-dev-ecosystem on
+# protected runners whose IPs are allowlisted by the Databricks
+# account IP ACL. This workflow is a thin trigger that dispatches
+# to eng-dev-ecosystem via the DECO workflow trigger GitHub App.
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+  issue_comment:
+    types: [created]
+
+  pull_request_review_comment:
+    types: [created]
+
+jobs:
+  # Automatic PR review when a PR is opened or updated.
+  review:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    environment: test-trigger-is
+    permissions:
+      contents: read
+
+    steps:
+      - name: Generate GitHub App token
+        id: token
+        uses: actions/create-github-app-token@v2
+        with:
+          app-id: ${{ secrets.DECO_WORKFLOW_TRIGGER_APP_ID }}
+          private-key: ${{ secrets.DECO_WORKFLOW_TRIGGER_PRIVATE_KEY }}
+          owner: databricks-eng
+          repositories: eng-dev-ecosystem
+
+      - name: Trigger Claude Code review
+        run: |
+          gh workflow run cli-claude-code.yml \
+            -R databricks-eng/eng-dev-ecosystem \
+            --ref main \
+            -F pull_request_number=${{ github.event.pull_request.number }} \
+            -F event_type=review
+        env:
+          GH_TOKEN: ${{ steps.token.outputs.token }}
+
+  # Interactive @claude mentions.
+  assist:
+    if: |
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude'))
+    runs-on: ubuntu-latest
+    environment: test-trigger-is
+    permissions:
+      contents: read
+
+    steps:
+      - name: Generate GitHub App token
+        id: token
+        uses: actions/create-github-app-token@v2
+        with:
+          app-id: ${{ secrets.DECO_WORKFLOW_TRIGGER_APP_ID }}
+          private-key: ${{ secrets.DECO_WORKFLOW_TRIGGER_PRIVATE_KEY }}
+          owner: databricks-eng
+          repositories: eng-dev-ecosystem
+
+      - name: Determine PR number
+        id: pr
+        run: |
+          if [ -n "$ISSUE_NUMBER" ]; then
+            echo "number=$ISSUE_NUMBER" >> "$GITHUB_OUTPUT"
+          else
+            echo "number=$PR_NUMBER" >> "$GITHUB_OUTPUT"
+          fi
+        env:
+          ISSUE_NUMBER: ${{ github.event.issue.number }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+
+      - name: Trigger Claude Code assist
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ steps.token.outputs.token }}
+          script: |
+            await github.rest.actions.createWorkflowDispatch({
+              owner: 'databricks-eng',
+              repo: 'eng-dev-ecosystem',
+              workflow_id: 'cli-claude-code.yml',
+              ref: 'main',
+              inputs: {
+                pull_request_number: '${{ steps.pr.outputs.number }}',
+                event_type: 'assist',
+                comment_body: process.env.COMMENT_BODY
+              }
+            });
+        env:
+          COMMENT_BODY: ${{ github.event.comment.body }}

.github/workflows/claude.yml

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+name: Claude
+
+# AI-assisted PR reviews and interactive @claude mentions.
+# This workflow delegates to the reusable claude-code.yml workflow
+# which handles authentication and execution.
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+  issue_comment:
+    types: [created]
+
+  pull_request_review_comment:
+    types: [created]
+
+jobs:
+  review:
+    if: github.event_name == 'pull_request'
+    uses: ./.github/workflows/claude-code.yml
+    with:
+      prompt: |
+        Review this PR. Focus on correctness, error handling, and adherence to the project's Go conventions documented in CLAUDE.md.
+
+        You MUST post all code-specific feedback as inline comments using the mcp__github_inline_comment__create_inline_comment tool. For each issue you find, call this tool with the file path, line number, and your comment. Always set confirmed: true. Do NOT put code-level feedback in a summary comment.
+
+        After posting all inline comments, write a brief summary to a temporary file and post it with: pr-comment --body-file <path>. The summary should only list the number of inline comments posted and a one-line overview. If you have no issues to raise, just post a short comment saying the PR looks good.
+      allowed_tools: |
+        mcp__github_inline_comment__create_inline_comment
+        Bash(pr-diff)
+        Bash(pr-diff *)
+        Bash(pr-view)
+        Bash(pr-view *)
+        Bash(pr-comment *)
+        Bash(git log)
+        Bash(git log *)
+        Bash(git diff)
+        Bash(git diff *)
+        Bash(git show *)
+        Bash(grep *)
+        Read
+        Write
+        Glob
+        Grep
+      claude_args: '--max-turns 100 --allowedTools "mcp__github_inline_comment__create_inline_comment"'
+
+  assist:
+    if: |
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude'))
+    uses: ./.github/workflows/claude-code.yml
+    with:
+      allowed_tools: |
+        mcp__github_ci__get_ci_status
+        mcp__github_ci__get_workflow_run_details
+        mcp__github_ci__download_job_log
+        Bash(make lint)
+        Bash(make test)
+        Bash(make fmt)
+        Bash(make schema)
+        Bash(go build *)
+        Bash(go test *)
+        Bash(go vet)
+        Bash(go vet *)
+        Bash(git add *)
+        Bash(git commit *)
+        Bash(pr-push)
+        Bash(pr-push *)
+        Bash(git diff)
+        Bash(git diff *)
+        Bash(git log)
+        Bash(git log *)
+        Bash(git status)
+        Bash(git show *)
+        Bash(pr-comment *)
+        Bash(pr-view)
+        Bash(pr-view *)
+        Bash(grep *)
+        Read
+        Edit
+        Write
+        Glob
+        Grep
+      claude_args: "--max-turns 100"