NanoGPT exposes per-thinking-level model IDs (e.g.
anthropic/claude-opus-4.6:thinking:low) as separate entries. These
pollute the model list and collide with parseModelString's thinking
level suffix stripping.
Filter out all :thinking and :thinking:level suffixed nanogpt models
during discovery. When a :thinking variant existed, mark the
corresponding base model as reasoning-capable. NanoGPT already supports
reasoning_effort via the OpenAI-compat path so no provider-side model
ID suffixing is needed.
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