- e2e.py: scenario 13 (http fallback) — drives a full turn over the
HTTP leg (health + POST /v1/frame + SSE /v1/events, no WS) and
asserts the user echo lands on the SSE stream in < 1.5 s.
- ws_probe.py --http: prints '== user echo in X.XXs' (the docs/19
sendable-in-fallback timing assertion) alongside the existing
health/POST/SSE output; same assertion flags as the WS leg.
- docs: 19 status flipped to implemented; 09-pairing-security §9.4
cross-reference (second door, same lock: token + device allowlist,
64 KiB cap, rate limit, optional TLS, unauthenticated /v1/health);
13-testing manual scenario 15 + automated pointers.