chore: add PR template + customer bump + stale auto-close

.github/pull_request_template.md

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+## Summary
+<!-- 1–3 sentences. What does this PR do and why? -->
+
+## Related
+<!-- Closes #123 / Ref tracebloc/other-repo#456 -->
+
+## Type of change
+- [ ] Feature
+- [ ] Bug fix
+- [ ] Tech-debt / refactor
+- [ ] Docs
+- [ ] Security / hardening
+- [ ] Breaking change
+
+## Test plan
+<!-- What did you test? Commands run? Manual steps? -->
+
+## Screenshots / recordings
+<!-- For UI changes. Remove if N/A. -->
+
+## Deployment notes
+<!-- Env vars, migrations, rollout order, feature flags. Remove if N/A. -->
+
+## Checklist
+- [ ] Tests added / updated and passing locally
+- [ ] Docs updated if behavior or config changed
+- [ ] No secrets / credentials in the diff
+- [ ] For security-sensitive paths: appropriate reviewer requested

.github/workflows/customer-priority-bump.yml

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+name: Customer priority bump
+
+on:
+  issues:
+    types: [labeled]
+
+jobs:
+  bump:
+    uses: tracebloc/.github/.github/workflows/customer-priority-bump.yml@main
+    secrets: inherit

.github/workflows/set-pr-status.yml

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+name: Set PR Status
+
+on:
+  pull_request:
+    types: [opened, reopened, ready_for_review, converted_to_draft]
+
+jobs:
+  set-status:
+    uses: tracebloc/.github/.github/workflows/set-pr-status.yml@main
+    secrets: inherit

.github/workflows/stale-backlog.yml

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+name: Close stale backlog issues
+
+on:
+  schedule:
+    - cron: '0 0 * * 1'  # Mondays 00:00 UTC
+  workflow_dispatch: {}
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          days-before-issue-stale: 42  # 6 weeks of no activity → warning
+          days-before-issue-close: 14  # +2 weeks of silence → close
+          stale-issue-label: 'stale'
+          stale-issue-message: |
+            👋 This issue has had no activity for 6 weeks.
+
+            If it's still relevant, please leave a comment with current context (or assign someone). Otherwise it will auto-close in 2 weeks.
+
+            To exempt permanently, add the `keep-open` label.
+          close-issue-message: |
+            Closing due to 8+ weeks of inactivity. Please reopen with current context if relevant.
+          exempt-issue-labels: 'keep-open,blocked'
+          # PRs: don't auto-stale — branch protection + active reviews govern those
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          operations-per-run: 50