* fix(recording): handle unexpected filenames in cache maintainer to prevent crash
* test(recording): add test for maintainer cache file parsing
* Prevent log spam from unexpected cache files
Addresses PR review feedback: Add deduplication to prevent warning
messages from being logged repeatedly for the same unexpected file
in the cache directory. Each unexpected filename is only logged once
per RecordingMaintainer instance lifecycle.
Also adds test to verify warning is only emitted once per filename.
* Fix code formatting for test_maintainer.py
* fixes + ruff
