New code-airouter-deepseekv4flash-tdd-repo/v1 composite (deepseek
methodology + the same tdd-protect/tdd-gate/python-dev/tdd-file-lock
layers as the Qwen TDD composite), plus a task-template that sets
reasoning_effort=max via the new extra_body passthrough (agent-runtimes
TT-38). Model/endpoint/model-registry entries already existed; only
the TDD-capable harness and the template were missing.
