d60b77d4f1
The dispatch-layer op-feed's handshake req-summary read req.get("capabilities_requested"),
a field that never exists on the wire — bifrost's handshake handler reads
request_body["capabilities"] (reference_server/_protocol.py:181). So the op-feed's
caps_requested was silently ALWAYS None on every handshake. Read the real field.
Surfaced by the heid-code-review panel (Regin) during the #18 D1 review — a latent
#17 observability bug, not D1 drift. Regression test asserts caps_requested is
populated from a handshake body's capabilities.
Suite 502 -> 503 green.