extractSearchTerms now splits camelCase, PascalCase, snake_case, and
dot.notation into individual tokens (e.g. "getUserName" → ["user", "name"]).
Stop words expanded with code-specific noise words (code, file, function,
method, class, type, etc.) to improve search precision.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>