Codex Phase-1 gate found the RFC cited stale/wrong source anchors (docs-only, but
actively misleading to future implementers): /api/sessions/events is routed at
routes.py:12345-12346 (RFC said 12320-12321 = /api/chat/cancel);
_handle_session_events_stream at 16177 (RFC said 16142 = a gateway-sse comment);
replay reads after_event_id/after_seq QUERY PARAMS (RFC said Last-Event-ID header
— that's the *proposed* new-endpoint contract, not current). Corrected all six
routes.py anchors + the replay-mechanism description, verified each against master.
The accompanying test asserted the WRONG anchors and passed (codifying the error).
Rewrote test_rfc_cites_current_global_endpoint_source to parse every routes.py
anchor from the RFC and verify it lands on the real /api/sessions/events route +
_handle_session_events_stream definition — so it now catches drift instead of
locking in a stale number.
Co-authored-by: rodboev <rodboev@users.noreply.github.com>
