Fix 30 NLP edge cases in Grammar, Spelling, and Punctuation (Phase 10 results and Extension UI improvements)

Fix collision benchmark: non-overlap, destructive tokenization, colon guard, hamza punctuation

fix: contextual logging, word merge overlap resolver, and responsive toolbar/footer UI

Fix collision resolution and punctuation patch application errors

FIX-36: Merge punctuation into grammar when they overlap same span

Phase 14b: Fix spelling punct hallucination + cross-stage overlap

Phase 14: Fix StageLocker over-locking + PatchSet overlap resolution

feat: Pipeline Hardening v3.3 — stage ownership, punctuation safety, UUID migration