Quality improvements: Unicode chars, Token class, imports, type hints, formatting

fix: re-apply Python 3.10 UTC compatibility (was reverted by formatter)

fix: easter-egg ticker now properly works in Gradio app

feat: federated RAG + comprehensive security fixes

feat: impl_ref §22 gap-fill — all missing symbols implemented

fix: 0 test failures; FileService; real RagService; emergency probe; chat return

feat: Phase 2 (M14-M25, X05-X07) + Phase 3 experimental (M26-M31) + E2E tests + docs

feat: implement all M01-M13, X01-X04 modules + quality gate fixes