Universal Agent V3.1 - Skill Runtime Integration Major Features: - Semantic skill discovery (pgvector) - Dual-phase discovery (pre/post Ex Nihilo) - Unified HITL (pipeline + skill level) - Hybrid token budget (3 levels) - Tier-gated access control - 6 execution types via ExecutionRouter New Components: - src/integration/* - V3 integration layer - Migration 009 - V3 analytics tables Backward Compatible: - V2 endpoints still available - File-based skills as fallback