fix(monitoring): persist session summaries to avoid history scans

- Maintain counts and display snapshots in source transactions with replay-safe deduplication.
- Read session lists exclusively from summaries and remove execution-only filters.
- Automatically initialize historical summaries in bounded, resumable batches during OSS startup.
- Add behavioral contracts covering accounting, retention, query cost and PostgreSQL concurrency.

Verified with the required session_summary suite and real container upgrade startup.

.github/workflows/run-tests.yml

@@ -12,6 +12,8 @@ on:
       - 'run_tests.sh'
       - 'scripts/test-*.sh'
       - 'pytest.ini'
+      - 'AGENTS.md'
+      - 'ARCHITECTURE.md'
   push:
     branches:
       - master
@@ -157,6 +159,19 @@ jobs:
           path: postgres-contract-results.xml
           if-no-files-found: ignore
 
+      - name: Run required session summary contracts
+        run: |
+          uv run --no-sync pytest --required-suite session_summary \
+            -q --tb=short -rs --junitxml=session-summary-results.xml
+
+      - name: Upload session summary contract results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: session-summary-results
+          path: session-summary-results.xml
+          if-no-files-found: ignore
+
   e2e:
     name: E2E Startup Tests
     runs-on: ubuntu-latest