log: Add tracing events through core for future debugability.

crates/pikl-core/src/runtime/hook.rs

@@ -81,7 +81,10 @@ pub trait HookHandler: Send + Sync {
 /// tracing.
 pub fn parse_hook_response(line: &str) -> Option<HookResponse> {
     match serde_json::from_str::<HookResponse>(line) {
-        Ok(resp) => Some(resp),
+        Ok(resp) => {
+            tracing::debug!(response = ?resp, "parsed hook response");
+            Some(resp)
+        }
         Err(e) => {
             tracing::warn!(line, error = %e, "failed to parse hook response");
             None