poc-daemon: reset nudge timer on tool use, move nudge interval to claude

PostToolUse now signals response activity so the nudge timer resets
while I'm actively working. Nudge interval constant moved from
thalamus (where it doesn't belong) to consciousness-claude.

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

src/poc-hook.rs

@@ -260,6 +260,7 @@ fn main() {
             }
         }
         "PostToolUse" => {
+            signal_response();
             print!("{}", memory_search::run_hook(&input));
 
             if let Some(ref t) = transcript {