test(e2e): add JSON-RPC L7 failure diagnostics #2192

Job	Run time
Resolve PR metadata	9s
build-supervisor / Resolve build plan	3s
build-gateway / Resolve build plan	4s
build-supervisor / Rust sandbox (arm64) / sandbox (arm64)	3m 40s
build-supervisor / Rust sandbox (amd64) / sandbox (amd64)	3m 33s
build-gateway / Rust gateway (amd64) / gateway (amd64)	7m 1s
build-gateway / Rust gateway (arm64) / gateway (arm64)	7m 17s
build-supervisor / Build supervisor (arm64)	1m 20s
build-supervisor / Build supervisor (amd64)	1m 22s
build-supervisor / Merge supervisor manifest	1m 3s
build-gateway / Build gateway (arm64)	1m 32s
build-gateway / Build gateway (amd64)	1m 26s
gpu-e2e	-1s
GPU E2E result	0s
build-gateway / Merge gateway manifest	1m 5s
kubernetes-e2e / Kubernetes E2E (Rust smoke)	9m 22s
e2e / E2E (rust-podman-rootless)	9m 59s
e2e / E2E (rust-docker)	7m 8s
e2e / E2E (mcp)	6m 18s
e2e / E2E (rust-podman)	14m 43s
e2e / E2E (python)	6m 55s
kubernetes-ha-e2e	0s
Kubernetes HA E2E result	0s
Core E2E result	2s
	1h 24m 1s

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