merge poc-daemon and poc-hook into poc-memory repo

Move the notification daemon (IRC, Telegram, idle timer) and the
Claude Code hook binary into this repo as additional [[bin]] targets.
Single `cargo install --path .` now installs everything:

  poc-memory       — memory store CLI
  memory-search    — hook for memory retrieval
  poc-daemon       — notification/idle daemon (was claude-daemon)
  poc-hook         — Claude Code lifecycle hook (was claude-hook)

Renamed from claude-{daemon,hook} to poc-{daemon,hook} since the
infrastructure isn't tied to any specific AI assistant.

Co-Authored-By: ProofOfConcept <poc@bcachefs.org>

src/bin/poc-daemon/tmux.rs

@@ -0,0 +1,61 @@
+// 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.
+///
+/// Sequence: Escape q C-c C-u (clear input), wait, type message, Enter.
+pub fn send_prompt(pane: &str, msg: &str) -> bool {
+    info!("SEND [{pane}]: {}...", &msg[..msg.len().min(100)]);
+
+    let send = |keys: &[&str]| {
+        Command::new("tmux")
+            .arg("send-keys")
+            .arg("-t")
+            .arg(pane)
+            .args(keys)
+            .output()
+            .is_ok()
+    };
+
+    // Clear any partial input
+    if !send(&["Escape", "q", "C-c", "C-u"]) {
+        return false;
+    }
+    thread::sleep(Duration::from_secs(1));
+
+    // Type the message
+    if !send(&[msg]) {
+        return false;
+    }
+    thread::sleep(Duration::from_millis(500));
+
+    // Submit
+    send(&["Enter"])
+}