Make the public subactor/subllm policy the default route for every semantic
LLM request. The central policy selects direct Z.AI GLM 5.3. Keep the legacy
OpenRouter path only behind an explicit T2C_USE_SUBLLM=false compatibility
override; never silently bypass a requested or default SubLLM route.
glm-5.3 and the public Todo2code repository URL.T2C_USE_SUBLLM=false remains the only explicit compatibility opt-out.