file_length: exclude Mapperatorinator from the 250-line cap

Upstream clone at ~/Mapperatorinator is a third-party sibling (MIT,
github.com/OliBomby/Mapperatorinator), driven by subprocess from
~/osu-automapper and never vendored or modified.

Verified both directions: is_vendored() returns True for a 2538-line upstream
file (which would otherwise fail the cap) and False for ~/osu-automapper's own
sources, which stay gated.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018iJHHN18dud8dXpjd7ff3R

file_length/config.py

@@ -179,6 +179,7 @@ THIRD_PARTY_REPOS = frozenset(
         "freesound-mcp",  # github.com/timjrobinson/FreesoundMCPServer
         "llama_cpp_dart_local",  # generated FFI bindings
         "aseprite-mcp",
+        "Mapperatorinator",  # github.com/OliBomby/Mapperatorinator
         "aur",
         "build-your-own-x",
         "build_your_x",