## Summary
Remove `docs/auth-login-logging-plan.md`.
## Why
The document was a temporary planning artifact. The durable rationale
for the
auth-login diagnostics work now lives in the code comments, tests, PR
context,
and existing implementation notes, so keeping the standalone plan doc
adds
duplicate maintenance surface.
## Testing
- not run (docs-only deletion)
Co-authored-by: Codex <noreply@openai.com>