Add AutoTriage labeling workflows

.github/AutoTriage.prompt

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+# DesktopClock AutoTriage Policy
+
+## Scope
+- The only allowed action is applying labels to the issue or pull request being triaged.
+
+## Rules
+- Apply the single best primary label (`bug`, `enhancement`, or `question`) when one clearly fits.

.github/workflows/autotriage-issues.yml

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+name: AutoTriage (Issues)
+
+on:
+  issues:
+    types: [opened]
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
+jobs:
+  triage_issue:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: AutoTriage - triage issue
+        uses: danielchalmers/AutoTriage@v3
+        with:
+          issues: ${{ github.event.issue.number }}
+          prompt-path: .github/AutoTriage.prompt
+          model-fast: ""
+          model-pro: gemini-3.1-flash-lite-preview
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}

.github/workflows/autotriage-prs.yml

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+name: AutoTriage (PRs)
+
+on:
+  pull_request_target:
+    types: [opened, ready_for_review]
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
+jobs:
+  triage_pr:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: AutoTriage - triage PR
+        uses: danielchalmers/AutoTriage@v3
+        with:
+          issues: ${{ github.event.pull_request.number }}
+          prompt-path: .github/AutoTriage.prompt
+          model-fast: ""
+          model-pro: gemini-3.1-flash-lite-preview
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}