fix idle timer restart and hook event detection

Two fixes:

1. Reset activity timestamps to now() on daemon restart instead of
   loading stale values and suppressing with fired=true. Timers
   count cleanly from restart.

2. Fix poc-hook to read hook_event_name (not type) from Claude Code's
   JSON input. The hook was being called but never matched any event.
   Also switch daemon_cmd from spawn() to status() since the command
   takes 2ms — no reason to fire-and-forget.

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

src/bin/poc-hook.rs

@@ -35,7 +35,7 @@ fn daemon_cmd(args: &[&str]) {
         .args(args)
         .stdout(std::process::Stdio::null())
         .stderr(std::process::Stdio::null())
-        .spawn()
+        .status()
         .ok();
 }
 
@@ -134,7 +134,7 @@ fn main() {
         Err(_) => return,
     };
 
-    let hook_type = hook["type"].as_str().unwrap_or("unknown");
+    let hook_type = hook["hook_event_name"].as_str().unwrap_or("unknown");
     let transcript = hook["transcript_path"]
         .as_str()
         .filter(|p| !p.is_empty())