Add runner diagnostics and rebalance source lanes

.gitea/workflows/cicd.yaml

@@ -354,8 +354,9 @@ jobs:
 
   precommit-tests:
     name: Pre-commit Checks
-    # Use ubuntu-act runner pool for consistent availability.
-    runs-on: ubuntu-act
+    # Pin one source-check lane to the 8GB pool so source checks can fan out
+    # across both runner pools instead of serializing behind a single label.
+    runs-on: ubuntu-act-8gb
     timeout-minutes: 30
     needs: build_cicd
     steps:
@@ -400,8 +401,9 @@ jobs:
 
   frontend-tests:
     name: Frontend Tests
-    # Use ubuntu-act runner pool for consistent availability.
-    runs-on: ubuntu-act
+    # Pin one source-check lane to the 8GB pool so source checks can fan out
+    # across both runner pools instead of serializing behind a single label.
+    runs-on: ubuntu-act-8gb
     timeout-minutes: 25
     needs: build_cicd
     steps:

backend/pyproject.toml

@@ -154,6 +154,8 @@ reset = [
   {shell = "cd frontend && rm -rf node_modules 2>/dev/null || true"},
   "deps-install"
 ]
+runner-diagnostics = {shell = "xonsh ./scripts/gitea-actions/collect_runner_diagnostics.xsh", help = "Collect recent runner, docker, and system diagnostics from all known runner hosts"}
+runner-discover = {shell = "xonsh ./scripts/gitea-actions/discover-runners.xsh --batch", help = "Collect runner inventory, labels, and baseline health from all known runner hosts"}
 # === Development Setup (New Developer Onboarding) ===
 setup = [
   "deps-install",