Standardize project name to lowercase 'g3' throughout documentation,
comments, and configuration files. Environment variables (G3_*) are
unchanged as they follow the uppercase convention.
Agent: lamport
Changes:
- docs/architecture.md: Replace non-existent g3-console with studio crate,
remove references to non-existent retro_tui.rs, update g3-cli module list
to reflect actual source files, fix execution modes list
- docs/tools.md: Add missing Research & Memory Tools section documenting
research, remember, and rehydrate tools with examples and notes
- AGENTS.md: Fix error logs path from logs/errors/ to .g3/errors/
- README.md: Remove references to non-existent CONTRIBUTING.md and LICENSE
All documentation links verified working.