docs: update README, wiki overview, index, log; add roles/code-review/pydantic wiki pages
- README: remove autogen/crewai references, add v2 architecture diagram,
code-review scenario, cross-LLM config examples, roadmap
- wiki/overview: event-driven architecture, Pydantic v2, roadmap
- wiki/index: add entities/roles, concepts/code-review, packages/pydantic
- wiki/log: Phase 1 completion, code-review decision
- New: entities/roles.md, concepts/code-review.md, packages/pydantic.md
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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