file-searcher

When to use

• User asks "where is X used/defined" or "find occurrences of pattern".

Procedure

1. Translate the question into a concise regex pattern.
2. Call file_search:
   • pattern: the regex
   • optional extensions: narrow to .cs,.md,.proto etc
3. Return results as a short list: file + line + snippet.
4. If truncated, narrow the search (extensions / more specific pattern) and repeat.