- Update README.md to present Amp CLI as standard feature, not fork differentiator
- Remove USING_WITH_FACTORY_AND_AMP.md (fork-specific, Factory docs live upstream)
- Add comprehensive docs/amp-cli-integration.md with setup, config, troubleshooting
- Eliminate fork justification messaging throughout documentation
- Prepare Amp CLI integration for upstream merge consideration
This positions Amp CLI support as a natural extension of CLIProxyAPI's
multi-client architecture rather than a fork-specific feature.
