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Architecture: - director_v2: always-on brain, produces DirectorPlan with tool_sequence - thinker_v2: pure executor, runs tools from DirectorPlan - interpreter_v1: factual result summarizer, no hallucination - v2_director_drives graph: Input -> Director -> Thinker -> Output Infrastructure: - Split into 3 pods: cog-frontend (nginx), cog-runtime (FastAPI), cog-mcp (SSE proxy) - MCP survives runtime restarts (separate pod, proxies via HTTP) - Async send pipeline: /api/send/check -> /api/send -> /api/result with progress - Zero-downtime rolling updates (maxUnavailable: 0) - Dynamic graph visualization (fetched from API, not hardcoded) Tests: 22 new mocked unit tests (director_v2: 7, thinker_v2: 8, interpreter_v1: 7) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>