chore: run PR126 reviewed-plan synchronization gate

Author: TheHiddenObserver

.github/workflows/pr126-round4-plan-sync.yml

@@ -0,0 +1,46 @@
+name: PR126 round4 plan sync
+
+on:
+  push:
+    branches:
+      - agent/panel-p1-stage-c-covariance
+    paths:
+      - .github/workflows/pr126-round4-plan-sync.yml
+
+permissions:
+  contents: write
+
+jobs:
+  plan-sync:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: agent/panel-p1-stage-c-covariance
+          fetch-depth: 0
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Apply plan synchronization
+        run: python dev/pr126_round4_plan_sync.py
+      - name: Validate reviewed plan contract
+        run: |
+          python - <<'PY'
+          from pathlib import Path
+          text = Path('dev/plans/panel_p1_stage_c_covariance_plan.md').read_text(encoding='utf-8')
+          assert 'ordinary coordinate-wise BSE/test/p-value/CI output is explicitly unavailable' in text
+          assert 'Fresh correctness evidence uses schema v2' in text
+          assert '60 rows' in text
+          assert 'unbalanced two-way FE' in text
+          assert '`PanelOLS.predict()` and `RandomEffects.predict()`' in text
+          PY
+          git diff --check
+      - name: Commit synchronized reviewed plan
+        run: |
+          git config user.name 'github-actions[bot]'
+          git config user.email '41898282+github-actions[bot]@users.noreply.github.com'
+          git rm .github/workflows/pr126-round4-plan-sync.yml dev/pr126_round4_plan_sync.py
+          git add -f dev/plans/panel_p1_stage_c_covariance_plan.md
+          git diff --cached --check
+          git commit -m 'docs: synchronize PR126 reviewed plan after fix loop'
+          git push origin HEAD:agent/panel-p1-stage-c-covariance