Personality System Overhaul & Memory Seed Fix

Data graph rows are now included in pre-turn auto-seeding to prevent memory-related hallucinations.

• Feat(memory-seed): include data_graph rows in pre-turn auto-seed

• Feat(personality): 5-slider voice corpus drives user-facing system prompt

• Fix(personality): arbiter pass — reject bools, retry on empty corpus, truthful save toast

• Docs(web-interface): document Cognition → Personality subtab