ci: add Claude bot (#432)

Add Claude bot to this project.

Author: tdstein

.github/workflows/claude.yaml

@@ -0,0 +1,66 @@
+name: Claude
+on:
+  issues:
+    types:
+      - opened
+      - assigned
+  issue_comment:
+    types:
+      - created
+  pull_request:
+    paths:
+      - .github/workflows/claude.yaml
+  pull_request_review:
+    types:
+      - submitted
+  pull_request_review_comment:
+    types:
+      - created
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.issue.number || github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: false
+jobs:
+  default:
+    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')) ||
+      (github.event_name == 'issues' && contains(github.event.issue.body, '@claude')) ||
+      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
+      github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+      id-token: write
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          fetch-depth: 1
+      - uses: aws-actions/configure-aws-credentials@v5
+        with:
+          role-to-assume: arn:aws:iam::440849847947:role/claude-code-gha
+          role-session-name: gha-claude-code-action
+          aws-region: us-east-2
+      - id: generate-token
+        uses: actions/create-github-app-token@v2
+        with:
+          app-id: 1129585
+          private-key: ${{ secrets.POSIT_CONNECT_PROJECTS_PEM }}
+      - uses: anthropics/claude-code-action@v1
+        with:
+          use_bedrock: true
+          github_token: ${{ steps.generate-token.outputs.token }}
+          branch_prefix: claude-
+          additional_permissions: "actions: read"
+          track_progress: true
+          prompt: |
+            You are a helpful AI assistant for code reviews and issue triage.
+            Respond to comments and issues that mention you with relevant code suggestions or triage actions.
+            If you cannot assist, politely inform the user. In your responses, don't be overly complimentary.
+            Stick to the facts and provide actionable advice.
+          claude_args: |
+            --model us.anthropic.claude-sonnet-4-5-20250929-v1:0
+            --fallback-model us.anthropic.claude-haiku-4-5-20251001-v1:0
+            --allowedTools mcp__github__create_pull_request,mcp__github__create_issue,mcp__github__search_issues,mcp__github__update_issue,mcp__github__create_pending_pull_request_review,mcp__github__add_pull_request_review_comment_to_pending_review,mcp__github__submit_pending_pull_request_review,mcp__github__get_pull_request_diff