Four chat_completions profiles (kimi-coding, deepseek, opencode-go's Kimi K2 and DeepSeek branches, actual) each hand-rolled the same extra_body.thinking / top-level reasoning_effort translation, and the copies had already drifted in small ways (kimi's `.get("enabled", True)`, deepseek's separate effort parsing). agent.reasoning_effort.thinking_toggle_extras is now the single implementation: the Moonshot default emits effort XOR toggle (both is an HTTP 400), and always_emit_toggle=True covers DeepSeek's contract where the toggle must ride on every request to dodge the reasoning_content echo trap. actual keeps its two contract-specific lines (reasoning_config None -> nothing; effort "none" -> disabled toggle plus reasoning_effort="none", which the relay accepts as a real level) and delegates the rest. ox_alpha_reasoning_extras moves alongside so opencode-free imports it like any other helper instead of reaching into the zen plugin's module through sys.modules and swallowing every exception into ({}, {}) - a failure there previously silently dropped the user's effort setting. No wire behavior changes; tests/plugins/model_providers/test_thinking_toggle_parity.py pins the XOR invariant across the matrix and zen/free parity.
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