README: complete rewrite with visual architecture, animations, feature map, usage guide

Update README with interactive hero, mermaid tracks, and v3 features

v2.1.0: README with Spark/Flow/swarm/Council/Vault naming + API reference table

docs: Final README with real-world results, pip install, 3 usage levels

release: Purpose Agent v2.0.0 — final README with 13-paper architecture

feat: Rewrite README — lead with easy API, 3 usage levels, complete docs

v0.2.0: Complete README with SLM-native, multi-agent, HITL, eval, streaming, tools, observability

Add YAML metadata to repo card

Add comprehensive README