- Remove all RFC 8693 token exchange tests (integration, manual, keycloak)
since Nextcloud doesn't support bearer tokens without upstream patches
- Remove manual impersonation/ADR-004 scripts and their docs
- Clean up token_exchange singleton from integration conftest
- Improve logging in _complete_login_flow_v2_as_user with step-by-step
[username] prefixed messages matching _complete_login_flow_v2 style
- Remove unnecessary time staggering from all_login_flow_user_tokens;
concurrent token acquisition works without artificial delays
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>