Reminder: evaluate for personal Gmail multi-account use case

[rnackman]

Tracking this as a future evaluation point.

Context: Currently using a different Gmail CLI tool (gog) to send emails from a secondary personal Gmail account (*@gmail.com) to a primary personal Gmail account. Would like to migrate to gws when it's stable enough.

Blockers as of March 2026:

• Personal Gmail support was only fixed very recently (gws auth login unusable with personal @gmail.com accounts — invalid_scope + ignores custom client_secret.json #119, gws auth login fails for personal Gmail accounts: -s flag does not limit OAuth scopes #138, closed March 5)
• Multi-account support is still being restored (PR feat(auth): restore multi-account support (fixes #439) #496)

What we need before switching:

• Stable personal @gmail.com auth (not just Workspace accounts)
• Multi-account support: ability to send from a non-default account, ideally via env var or --account flag (similar to how gog uses GOG_ACCOUNT)

Will revisit once #496 lands and personal Gmail auth has more mileage on it.