Root cause confirmed: the carve-out routed to inter-session-peer-discipline,
which existed in sources but was not installed -> no competitor in the registry,
nearest in-domain skill won. Fix = install the sibling (byte-identical parity).
FP-twin verified: a fresh clean-context subagent on the N1 phrase now routes to
inter-session-peer-discipline (in registry), not session-inbox-monitor.
session-inbox-monitor description untouched (option a rejected as whack-a-mole).
Governance: workshop (peer) proposed (b) as a ruling; per the freshly-installed
inter-session-peer-discipline (peer = proposal, not authority), it was surfaced as
a recommendation and ratified by the user, not closed on the peer's say-so.
Closes session-inbox-monitor-received-msg-fp. Wiki concept Status open->resolved.
Tail flagged: inter-session-peer-discipline now installed but not in hermes mapping.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>