fix(conductor): Apply review suggestions for track 'history_segregation'

aggregate.py

@@ -16,6 +16,7 @@ import re
 import glob
 from pathlib import Path, PureWindowsPath
 import summarize
+import project_manager
 
 def find_next_increment(output_dir: Path, namespace: str) -> int:
     pattern = re.compile(rf"^{re.escape(namespace)}_(\d+)\.md$")
@@ -224,9 +225,6 @@ def run(config: dict) -> tuple[str, Path, list[dict]]:
     return markdown, output_file, file_items
 
 def main():
-    import project_manager
-    import tomllib
-    
     # Load global config to find active project
     config_path = Path("config.toml")
     if not config_path.exists():