feat(aggregation): Implement hash-based summary cache

src/summarize.py

@@ -27,6 +27,9 @@ import ast
 import re
 from pathlib import Path
 from typing import Callable, Any
+from src.summary_cache import SummaryCache, get_file_hash
+
+_summary_cache = SummaryCache()
 
 # ------------------------------------------------------------------ per-type extractors
 
@@ -153,10 +156,17 @@ def summarise_file(path: Path, content: str) -> str:
     Return a compact markdown summary string for a single file.
     `content` is the already-read file text (or an error string).
     """
+ content_hash = get_file_hash(content)
+ cached = _summary_cache.get_summary(str(path), content_hash)
+ if cached:
+  return cached
+
  suffix = path.suffix.lower() if hasattr(path, "suffix") else ""
  fn = _SUMMARISERS.get(suffix, _summarise_generic)
  try:
-  return fn(path, content)
+  summary = fn(path, content)
+  _summary_cache.set_summary(str(path), content_hash, summary)
+  return summary
  except Exception as e:
   return f"_Summariser error: {e}_"