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+# VPN Runtime CI Stabilization Changelog
+
+Date: 2026-05-12
+
+This note summarizes local stabilization work for `agents/rap-node-agent/internal/vpnruntime`
+and related CI hardening.
+
+## Commit Chain
+
+1. `a3c0998e`  
+   Stabilize parallel flow-window test behavior and add initial CI anti-flake checks.
+
+2. `fea5174e`  
+   Add `-race` CI check for `vpnruntime`.
+
+3. `4603826b`  
+   Add transfer notes with patch/bundle usage instructions.
+
+4. `6fec1d5c`  
+   Add targeted CI anti-flake step for the previously flaky test:
+   `TestFabricClientPacketIngressParallelFlowWindowDoesNotBlockIndependentChannel`.
+
+## Key Technical Changes
+
+- Test determinism fix in `fabric_transport_test.go`:
+  fast send now waits for observed slow-send start boundary, so overlapping
+  in-flight behavior is exercised consistently.
+
+- CI workflow hardening in `.github/workflows/build.yml`:
+  - backend now runs `go test ./...`
+  - new `node-agent` job with:
+    - `go test ./...`
+    - `go test ./internal/vpnruntime -count=20`
+    - `go test ./internal/vpnruntime -run TestFabricClientPacketIngressParallelFlowWindowDoesNotBlockIndependentChannel -count=50 -timeout=60s`
+    - `go test -race ./internal/vpnruntime`
+
+## Local Validation Snapshot
+
+- `go test ./internal/vpnruntime -count=100` passed.
+- `go test ./internal/vpnruntime -run TestFabricClientPacketIngressParallelFlowWindowDoesNotBlockIndependentChannel -count=50 -timeout=60s` passed.
+- `go test -race ./internal/vpnruntime` passed.
+- `go test ./...` passed in:
+  - `agents/rap-node-agent`
+  - `backend`
+
+## Transfer/Recovery Artifacts
+
+Local export files are available in ignored path:
+
+- `artifacts/git-patches/0001-Stabilize-vpnruntime-parallel-flow-test-and-add-CI-a.patch`
+- `artifacts/git-patches/0002-Add-vpnruntime-race-check-to-CI.patch`
+- `artifacts/git-patches/vpnruntime-ci-fixes.bundle`
+
+See:
+
+- `docs/operations/VPNRUNTIME_CI_FIXES_TRANSFER_2026-05-12.md`
+