Add CI gate workflow to wait for all checks

Self-contained workflow that polls for all other checks to complete.
Use "All Checks Pass" as the single required status check in branch
protection - solves the issue where path-filtered workflows don't
always run.

No external action dependencies - uses inline gh API calls.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: raman325

.github/workflows/ci-gate.yaml

@@ -0,0 +1,74 @@
+---
+name: CI Gate
+
+# This workflow waits for all other checks to complete.
+# Use "All Checks Pass" as the single required status check in branch protection.
+# This solves the issue where workflows with path filters don't always run.
+
+# yamllint disable-line rule:truthy
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  checks: read
+  pull-requests: read
+
+jobs:
+  gate:
+    name: All Checks Pass
+    runs-on: ubuntu-latest
+    steps:
+      - name: Wait for all checks to complete
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPO: ${{ github.repository }}
+          SHA: ${{ github.event.pull_request.head.sha || github.sha }}
+          CURRENT_JOB: All Checks Pass
+        run: |
+          echo "Waiting for all checks on $SHA to complete..."
+
+          while true; do
+            # Get all check runs for this commit
+            CHECKS=$(gh api "repos/$REPO/commits/$SHA/check-runs" \
+              --jq '.check_runs | map({name: .name, status: .status, conclusion: .conclusion})')
+
+            # Count checks still in progress (excluding this job)
+            IN_PROGRESS=$(echo "$CHECKS" | jq --arg current "$CURRENT_JOB" \
+              '[.[] | select(.name != $current and .status != "completed")] | length')
+
+            # Check for any failures (excluding this job)
+            # Conclusion must be success, skipped, or neutral to pass
+            FAILED=$(echo "$CHECKS" | jq --arg current "$CURRENT_JOB" '
+              [.[] | select(
+                .name != $current and
+                .status == "completed" and
+                .conclusion != "success" and
+                .conclusion != "skipped" and
+                .conclusion != "neutral"
+              )] | length')
+
+            echo "In progress: $IN_PROGRESS, Failed: $FAILED"
+
+            if [ "$FAILED" -gt 0 ]; then
+              echo "::error::One or more checks failed"
+              echo "$CHECKS" | jq --arg current "$CURRENT_JOB" '
+                .[] | select(
+                  .name != $current and
+                  .status == "completed" and
+                  .conclusion != "success" and
+                  .conclusion != "skipped" and
+                  .conclusion != "neutral"
+                )'
+              exit 1
+            fi
+
+            if [ "$IN_PROGRESS" -eq 0 ]; then
+              echo "All checks completed successfully!"
+              break
+            fi
+
+            echo "Waiting 30 seconds..."
+            sleep 30
+          done