Add SRS automation: scheduler, logger, weekly gates

.github/workflows/gate.yml

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+name: Gate
+
+on:
+  schedule:
+    - cron: "0 12 * * 6" # Saturday 8 AM ET — create this week's gate
+  workflow_dispatch:
+  issues:
+    types: [closed] # grade a gate when it closes
+
+permissions:
+  contents: write
+  issues: write
+
+# Shared with srs-scheduler / srs-logger / srs-setup: never race on srs.json.
+concurrency:
+  group: srs-state
+  cancel-in-progress: false
+
+jobs:
+  create:
+    # Trigger A: the only issue-creating workflow in the SRS. The script
+    # no-ops when this week's gate already exists.
+    if: github.event_name != 'issues'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: oven-sh/setup-bun@v2
+
+      - run: bun scripts/srs-gate.ts create
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Commit state
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add .github/srs
+          git diff --cached --quiet && { echo "no state change"; exit 0; }
+          git commit -m "srs: create weekly gate [skip ci]"
+          for i in 1 2 3; do git push && exit 0; git pull --rebase; done
+          git push
+
+  close:
+    # Trigger B: grade, log, boost, badge.
+    if: >-
+      github.event_name == 'issues' &&
+      contains(github.event.issue.labels.*.name, 'gate')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: oven-sh/setup-bun@v2
+
+      - run: bun scripts/srs-gate.ts close
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Commit state
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add .github/srs docs/gate-log.md
+          git diff --cached --quiet && { echo "no state change"; exit 0; }
+          git commit -m "srs: grade gate #${{ github.event.issue.number }} [skip ci]"
+          for i in 1 2 3; do git push && exit 0; git pull --rebase; done
+          git push