Rewrite README: 322 → 152 visible lines, results above fold

- Move LatentMAS citation to tagline (line 9)
- Move results table to line 31 (was line 93)
- Keep ONE code example visible, collapse rest into <details>
- Remove API Reference, Key Concepts, Error Types (belong in docs)
- Remove ASCII architecture diagram (keep Mermaid)
- Collapse cross-model, Easy API, vLLM, cross-process into <details>
- Condense Works With table
- Update latent steps to 10, benchmark numbers to latest

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: SStas