Replace Mocha with Node:test and update CI workflows

.claude/CLAUDE.md

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+## Git Workflow
+
+Always work on a feature branch. Never commit or push directly to 
+master, main, or any release branch.
+
+Branch naming: `claude/<short-description>`
+e.g. `claude/fix-login-bug`, `claude/add-payment-endpoint`
+
+Workflow for every task:
+1. `git checkout master && git pull`
+2. `git checkout -b claude/<description>`
+3. Make changes and commit
+4. `git push -u origin claude/<description>`
+5. `gh pr create`
+
+Never force push. Never delete branches. Never merge your own PRs.

.github/workflows/claude.yml

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+name: Claude Code
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  claude:
+    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 == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
+      (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
+      id-token: write
+      actions: read # Required for Claude to read CI results on PRs
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code
+        id: claude
+        uses: anthropics/claude-code-action@v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+
+          # Optional: Customize the trigger phrase (default: @claude)
+          # trigger_phrase: "/claude"
+
+          # Optional: Trigger when specific user is assigned to an issue
+          # assignee_trigger: "claude-bot"
+
+          # Optional: Configure Claude's behavior with CLI arguments
+          # claude_args: |
+          #   --model claude-opus-4-1-20250805
+          #   --max-turns 10
+          #   --allowedTools "Bash(npm install),Bash(npm run build),Bash(npm run test:*),Bash(npm run lint:*)"
+          #   --system-prompt "Follow our coding standards. Ensure all new code has tests. Use TypeScript for new files."
+
+          # Optional: Advanced settings configuration
+          # settings: |
+          #   {
+          #     "env": {
+          #       "NODE_ENV": "test"
+          #     }
+          #   }

.github/workflows/publish.yml

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+name: Publish
+on:
+  push:
+    branches: release
+
+permissions:
+  id-token: write
+  contents: read
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 24
+          registry-url: 'https://registry.npmjs.org'
+          package-manager-cache: false
+      - run: npm ci
+      - run: npm test
+      - run: npm publish

.github/workflows/test.yml

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+name: Test
+on:
+  push:
+    branches: master
+  pull_request:
+    branches: master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 24
+      - run: npm ci
+      - run: npm test