move Claude Code-specific code from thalamus/ to claude/

Separates the Claude-specific daemon (idle timer, tmux pane detection,
prompt injection, RPC server, session hooks) from the universal
infrastructure (channels, supervisor, notify, daemon protocol).

thalamus/ now contains only substrate-independent code: the channel
client/supervisor, notification system, daemon_capnp protocol, and
shared helpers (now(), home()).

claude/ contains: idle.rs, tmux.rs, context.rs, rpc.rs, config.rs,
hook.rs (moved from subconscious/), plus the daemon CLI and server
startup code from thalamus/mod.rs.

All re-exports preserved for backward compatibility.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/subconscious/daemon.rs

@@ -1204,7 +1204,7 @@ WantedBy=default.target
     install_notify_daemon(&unit_dir, &home)?;
 
     // Install memory-search + poc-hook into Claude settings
-    crate::subconscious::hook::install_hook()?;
+    crate::claude::hook::install_hook()?;
 
     Ok(())
 }