Add SRS automation: scheduler, logger, weekly gates

.github/workflows/srs-setup.yml

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+name: SRS Setup
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  issues: read
+
+# Shared with the other SRS workflows: never race on srs.json.
+concurrency:
+  group: srs-state
+  cancel-in-progress: false
+
+jobs:
+  setup:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: oven-sh/setup-bun@v2
+
+      # Verifies PROJECT_PAT against the user project, creates the SRS
+      # single-select fields when missing, and re-mirrors every laddered
+      # problem's Target Date / SRS Stage / First Attempt. Idempotent.
+      - run: bun scripts/srs-setup.ts
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PROJECT_PAT: ${{ secrets.PROJECT_PAT }}