v0.6.0 - memory recall, vision breaker, presence FSM
Ranked memory recall over MEMORY.md plus every journal, auto-preloaded into each turn; memory_search shares the engine. see_image circuit breaker (3 fails, 10 min cooldown). Group turns see Barvis's own replies (no repeat greetings). Presence lifecycle and retry policy as explicit tested state machines. Docs in plain prose. Tests: 474 pass, 3 skip (no NVIDIA_API_KEY). Zig 0.16.0.