feat(opencortex): tmux TUI testing, unified LLM backend, daemon fixes
Submodule update includes: - feat(tui): background reader thread, error handling, TERM guard - feat(llm): unified OpenAI-compatible backend (Ollama/OpenRouter/OpenAI/Anthropic/Groq/Gemini) - fix(loop): correct .env loading path (.config/opencortex) - fix(daemon): restart with updated XDG harness files - fix(reason): add generate-tool-belt-prompt, policy explanation, deterministic gate
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