Improve LLM and CSV processing

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

drhider/names.py

@@ -0,0 +1,25 @@
+"""Helpers for assigning stable, collision-free output filenames."""
+
+import os
+from typing import Dict, Optional
+
+
+def resolve_name(name: str, content: bytes, seen: Dict[str, bytes]) -> Optional[str]:
+    """Return a unique name, or None when the same name and content were seen.
+
+    Name collisions with different content receive numeric suffixes before
+    the extension, while exact duplicates are omitted.
+    """
+    if name not in seen:
+        seen[name] = content
+        return name
+    if seen[name] == content:
+        return None
+
+    base, ext = os.path.splitext(name)
+    index = 2
+    while f"{base}_{index}{ext}" in seen:
+        index += 1
+    resolved = f"{base}_{index}{ext}"
+    seen[resolved] = content
+    return resolved