For users who don't want to share an SA credential with the rest of the team
(privacy concerns, third-party adopters, sensitive expenses), BYO-KEY.md
walks through creating their own service account: GCP project + Sheets API +
SA creation + JSON download + pointing config.json at the new key. Same code
path as the default install — the change is purely in service_account_path.
Honest about the trade-off: ~15 extra minutes vs ~5, plus rotation
responsibility moves to the user. Links to both READMEs as an opt-in
alternative.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
