Apply suggestions from code review

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: k82cn

executor_manager/src/shims/host_shim.rs

@@ -283,8 +283,10 @@ impl HostShim {
         if let Ok(flame_home) = env::var(FLAME_HOME) {
             let lib_path = Path::new(&flame_home).join("lib");
             if let Some(site_packages) = Self::find_site_packages(&lib_path) {
+                let site_packages_str = site_packages.to_string_lossy().to_string();
                 envs.entry("PYTHONPATH".to_string())
-                    .or_insert(site_packages.to_string_lossy().to_string());
+                    .and_modify(|e| *e = format!("{}:{}", site_packages_str, e))
+                    .or_insert(site_packages_str);
 
                 // Set LD_LIBRARY_PATH for all packages with native extensions (.so files)
                 let ld_paths = Self::find_native_lib_paths(&site_packages);

perf/flamepy/main.py

@@ -277,7 +277,7 @@ def collect_task_lifecycles(
         except Exception as e:
             print(f"Warning: Failed to collect tasks from session {session_id}: {e}")
 
-    if debug or True:
+    if debug:
         print(f"Events found: {events_found}")
         tasks_with_start = sum(1 for lc in lifecycles if lc.start_time)
         print(f"Tasks with start_time: {tasks_with_start}/{len(lifecycles)}")