Start staged execution and record Stage 1 preflight pass

docs/operations/VPNRUNTIME_STAGE_EXECUTION_2026-05-12.md

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+# VPN Runtime Stage Execution
+
+Date: 2026-05-12
+Current head at stage start: `874e2f14`
+
+## Stage Plan
+
+1. Stage 1 - Preflight baseline validation (local guard pipeline)
+2. Stage 2 - Transfer package refresh and integrity check
+3. Stage 3 - Remote push handoff readiness (auth-dependent)
+4. Stage 4 - Post-push verification checklist
+
+## Stage Status
+
+### Stage 1 - Completed
+
+Command:
+
+```powershell
+pwsh -NoProfile -ExecutionPolicy Bypass -File scripts/smoke/run-vpnruntime-ci-guards.ps1 -AntiFlakeCount 20 -TargetedCount 50
+```
+
+Result:
+
+- `go test ./...` (rap-node-agent): PASS
+- `go test ./internal/vpnruntime -count=20`: PASS
+- targeted anti-flake test (`-count=50`): PASS
+- `go test -race ./internal/vpnruntime`: PASS
+
+Next:
+
+- Proceed to Stage 2 (transfer package refresh and integrity check).
+