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>

.wiki/index.md

@@ -4,20 +4,21 @@ Catalog of all wiki pages. One line per page, organized by type. Updated on ever
 
 ## Overview
 
-- [overview.md](overview.md) — project overview
+- [overview.md](overview.md) — project overview, tech stack, roadmap
 
 ## Entities
 
-<!-- (none yet) -->
+- [roles.md](entities/roles.md) — discussion roles: moderator, skeptic, idea_generator, analyst, defender, attacker, security
 
 ## Concepts
 
 - [bootstrap-manifest.md](concepts/bootstrap-manifest.md) — skills used to initialize project structure
-- [meeting-room-v2.md](concepts/meeting-room-v2.md) — v2 architecture: interactive office with Web UI
+- [meeting-room-v2.md](concepts/meeting-room-v2.md) — v2 architecture: 4-phase plan, interactive office
+- [code-review.md](concepts/code-review.md) — cross-LLM code review pattern
 
 ## Packages
 
-<!-- (none yet) -->
+- [pydantic.md](packages/pydantic.md) — Pydantic v2 models for config, messages, sessions
 
 ## Sources