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## Problem When a user types `claw --model gpt-4` or `--model qwen-plus`, they get: ``` error: invalid model syntax: 'gpt-4'. Expected provider/model (e.g., anthropic/claude-opus-4-6) or known alias ``` USAGE.md documents that "The error message now includes a hint that names the detected env var" — but this hint does not actually exist. The user has to re-read USAGE.md or guess the correct prefix. ## Fix Enhance `validate_model_syntax` to detect when a model name looks like it belongs to a different provider: 1. **OpenAI models** (starts with `gpt-` or `gpt_`): ``` Did you mean `openai/gpt-4`? (Requires OPENAI_API_KEY env var) ``` 2. **Qwen/DashScope models** (starts with `qwen`): ``` Did you mean `qwen/qwen-plus`? (Requires DASHSCOPE_API_KEY env var) ``` 3. **Grok/xAI models** (starts with `grok`): ``` Did you mean `xai/grok-3`? (Requires XAI_API_KEY env var) ``` Unrelated invalid models (e.g., `asdfgh`) do not get a spurious hint. ## Verification - `claw --model gpt-4` → hints `openai/gpt-4` + `OPENAI_API_KEY` - `claw --model qwen-plus` → hints `qwen/qwen-plus` + `DASHSCOPE_API_KEY` - `claw --model grok-3` → hints `xai/grok-3` + `XAI_API_KEY` - `claw --model asdfgh` → generic error (no hint) ## Tests Added 3 new assertions in `parses_multiple_diagnostic_subcommands`: - GPT model error hints openai/ prefix and OPENAI_API_KEY - Qwen model error hints qwen/ prefix and DASHSCOPE_API_KEY - Unrelated models don't get a spurious hint All 177 rusty-claude-cli tests pass. Closes ROADMAP #154.