Response quality: greeting/goodbye/meta handlers, slang routing, lexical variety, last-verified badge, markdown norm, crisis variants

V4.4 Tier 1: regex hardening, clarify-stage enum, stat caveats, PDF unicode, retry/backoff, reproducibility doc

V4.3: prompt-injection audit, input length cap, per-layer ablation, unguarded baseline, limitations restored

V4.2 part 3: sycophancy guard, F-1 flag decay, incomplete-message handler

V4.2 part 2: authority-misconduct route + conversation history in rephraser

V4: streaming, controlled paraphrasing, support plan, voice, sweeps

Add LLM plan-and-rephrase layer with Groq + Anthropic providers