A registry-driven CreateSession/KillSession was reported to the registry twice:
the RPC reply (applied eagerly in create_session/kill_session) AND the async
SessionAdded/SessionRemoved the daemon emits on its own SessionManager stream.
Both landed, so the registry's catalog write had to be idempotent to absorb the
duplicate — masking bugs where the async event never arrives and setting a trap
for any future non-idempotent event (counters, partial updates).
Drop the duplicate at the source: the daemon parks the session id of an
RPC-initiated create/kill in a per-connection RpcCovered set and swallows the
matching async event (consumed exactly once) before it reaches the registry.
Spontaneous changes — sessions created via the daemon's local HTTP API, or
reaped on their own — are not parked and still forward, since the registry has
no other way to learn about them. A lag resync clears the set (the snapshot is
full truth). The registry's eager apply is now the authoritative single write,
not a race-bandaid; idempotency is no longer a correctness invariant.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
naps62-yoloandClaude Opus 4.8
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