vMLX 1.6.17

Public runtime, parser, cache, UI, and packaging checkpoint. Exact engine source d03ec297ef269bceb8a805726f6733a8c497f130. Both Sequoia and Tahoe DMGs are Developer ID signed, Apple notarized, stapled, Gatekeeper accepted, mounted-import verified, and installed-app smoke tested. This checkpoint retains explicitly documented PARTIAL rows for broader family/media/cache eviction and gateway soak, including one adversarial persisted-history reasoning-only M3 turn while fresh UI/direct/gateway prompts were healthy.