Copilot review (#2287): RFC 7591 §3.2 leaves a dynamically issued `client_id`
opaque, so `client_id === clientMetadataUrl` is not on its own proof that CIMD
ran — an authorization server could in principle mint that value from
`POST /register`.
Narrow the claim to a conjunction, whose decisive term is a registration we
recorded as CIMD ourselves rather than an inference about what the AS returned:
CIMD must be configured for this connection, the incoming `client_id` must be
exactly that metadata-document URL, and the registration already stored under
that id must be recorded as `cimd`. Everything else falls through to `dcr`.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lmj6X2epWpPE7ScdSKQmtA
Signed-off-by: cliffhall <cliff@futurescale.com>
c8c050b51e