Add e-commerce pre-training report — successful demo, behavioral clusters found, future improvements noted

Add finance pre-training report — honest analysis of results and lessons learned

Add ADR-002: Dataset selection for Phase 3 demos — research findings, rationale, phased plan

Update implementation report: add Phase 2D, update header to v0.4.0 / 139 tests, update cumulative summary and API

Add Phase 2A-2C implementation report — technical decisions, architecture summary, test results

Add ADR-001: Implementation framework decision with detailed roadmap

Add Nubank nuFormer reverse-engineering analysis — full pipeline reconstruction

Add comprehensive research report on domain-specific tokenization