Adds the home-daemon → registry control-link RPC that brokers a cross-daemon
session create/kill without putting any session bytes on the registry: the
owning daemon still does the tmux spawn, the registry just relays request and
reply.
- protocol: `DaemonOutbound::{ForwardCreate,ForwardKill}` +
`DaemonInbound::{ForwardCreateResult,ForwardKillResult}` (+ round-trip tests).
- registry: `Registry::{forward_create,forward_kill}` reuse the existing
`create_session`/`kill_session` R→D machinery and route the reply back to the
home daemon; transport faults map to stable `ErrorInfo` codes. Wired into the
`WS /daemon` dispatch.
Next: daemon-side broker handle + local_api wiring.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
naps62-yoloandClaude Opus 4.8
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