fix: close parser define gap and add legacy compatibility shims

fix: support Italian math operators and improve web fallback

chore: add compatibility alias for legacy knowledge_graph imports

fix: add web fallback for weak factual answers when KG misses

fix: use KG results in agent flow and harden llm fallback answer extraction

fix: handle wellbeing small-talk and prevent empty llm fallback answers

fix: enable llm by default in web chat and improve weak-answer fallback

fix: add favicon endpoint to avoid browser 404

feat: add casual conversation fast-paths and improve greeting detection

test: add master end-to-end reasoner validation

docs: update README with Question-Based Reasoner and test

test: add end-to-end master reasoning validation script

test: add comprehensive test suite for Question-Based Reasoner

feat: add Groq provider auto-detection and runtime config

fix: harden question_based logic and restore legacy compatibility