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/claude/tmux.rs

@@ -0,0 +1,54 @@
+// Tmux interaction: pane detection and prompt injection.
+
+use std::process::Command;
+use std::thread;
+use std::time::Duration;
+use tracing::info;
+
+/// Find Claude Code's tmux pane by scanning for the "claude" process.
+pub fn find_claude_pane() -> Option<String> {
+    let out = Command::new("tmux")
+        .args([
+            "list-panes",
+            "-a",
+            "-F",
+            "#{session_name}:#{window_index}.#{pane_index}\t#{pane_current_command}",
+        ])
+        .output()
+        .ok()?;
+
+    let stdout = String::from_utf8_lossy(&out.stdout);
+    for line in stdout.lines() {
+        if let Some((pane, cmd)) = line.split_once('\t') {
+            if cmd == "claude" {
+                return Some(pane.to_string());
+            }
+        }
+    }
+    None
+}
+
+/// Send a prompt to a tmux pane. Returns true on success.
+///
+/// Types the message literally then presses Enter.
+pub fn send_prompt(pane: &str, msg: &str) -> bool {
+    let preview: String = msg.chars().take(100).collect();
+    info!("SEND [{pane}]: {preview}...");
+
+    // Type the message literally (flatten newlines — they'd submit the input early)
+    let flat: String = msg.chars().map(|c| if c == '\n' { ' ' } else { c }).collect();
+    let ok = Command::new("tmux")
+        .args(["send-keys", "-t", pane, "-l", &flat])
+        .output()
+        .is_ok();
+    if !ok {
+        return false;
+    }
+    thread::sleep(Duration::from_millis(500));
+
+    // Submit
+    Command::new("tmux")
+        .args(["send-keys", "-t", pane, "Enter"])
+        .output()
+        .is_ok()
+}