ruff check --fix --select F541 . on current main. Pure prefix removals;
adjacent-string concatenations keep the f only on interpolating fragments.
No string content or live placeholder altered.
The library removed the static get_transcript() method in v1.0.
Migrate to the new instance-based fetch() API and normalize
FetchedTranscriptSnippet objects back to dicts for compatibility
with the rest of the script.
