Add GitHub Actions workflows for auto-labeling, PR checks, and issue triage

.github/labeler.yml

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+# Labels based on file paths
+# See https://github.com/actions/labeler for configuration options
+
+documentation:
+  - changed-files:
+      - any-glob-to-any-file:
+          - '*.md'
+          - 'docs/**'
+
+source:
+  - changed-files:
+      - any-glob-to-any-file:
+          - 'src/**'
+
+config:
+  - changed-files:
+      - any-glob-to-any-file:
+          - '*.json'
+          - '*.yml'
+          - '*.yaml'
+          - '.env*'
+
+workflows:
+  - changed-files:
+      - any-glob-to-any-file:
+          - '.github/**'

.github/workflows/auto-label.yml

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+name: Auto Label
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Label PR based on files changed
+        uses: actions/labeler@v5

.github/workflows/issue-triage.yml

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+name: Issue Triage
+
+on:
+  issues:
+    types: [opened]
+
+permissions:
+  issues: write
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Add triage label to new issues
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const issue = context.payload.issue;
+            if (context.payload.action === 'opened') {
+              await github.rest.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: issue.number,
+                labels: ['needs-triage']
+              });
+            }

.github/workflows/pr-checks.yml

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+name: PR Checks
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build