refactor(types): Phase 4 type hint sweep — core modules

summarize.py

@@ -26,6 +26,7 @@ context block that replaces full file contents in the initial <context> send.
 import ast
 import re
 from pathlib import Path
+from typing import Callable
 
 # ------------------------------------------------------------------ per-type extractors
 
@@ -138,7 +139,7 @@ def _summarise_generic(path: Path, content: str) -> str:
  return "\n".join(parts)
  # ------------------------------------------------------------------ dispatch
 
-_SUMMARISERS = {
+_SUMMARISERS: dict[str, Callable[[Path, str], str]] = {
  ".py":   _summarise_python,
  ".toml": _summarise_toml,
  ".md":   _summarise_markdown,