Update assistant persona to Mintoak Website Assistant, add evaluation scripts and update data

Implement systematic semantic relevance and domain-context filtering

Fix employee count hallucinations and expand fallback triggers

Fix technology head routing and add corporate M&A out-of-scope guardrails

Update leadership information, separate CTO query rules, and rebuild DB

Update RAG instructions for B2B merchant engagement and add evaluation report

feat: integrate fine-tuned Qwen 2.5 1.5B persona and evaluator parity

Update codebase and configure automatic environment switcher (excluding MLX adapters)

Deploy RAG chatbot with auto-population