- oauth.py: use status.HTTP_402_PAYMENT_REQUIRED constant (was raw 402)
- accounts.py bulk-invite: catch HTTPException separately to preserve
structured detail dict in failed-row error (was stringified repr,
unparseable by clients)
- Add bulk-invite per-row 402 test verifying structured error preserved
T8 code review identified these as Important issues. Functional change is
the bulk-invite fix; clients can now parse seat-limit errors from bulk
responses. 13/13 seat-enforcement tests pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>