```

feat(cli): add direct model inference via new run subcommand

- Add `aha run` CLI subcommand for direct model inference without HTTP service
- Support multiple models including Qwen series, OCR models, ASR models, and voice generation
- Implement input/output handling with file path support and auto-generation
- Add comprehensive documentation in CLI_USAGE.md with examples
- Include performance timing for model loading and inference operations
- Add macOS build target to Makefile with Metal support
```

src/exec/qwen3vl.rs

@@ -0,0 +1,52 @@
+//! Qwen3VL-2B exec implementation for CLI `run` subcommand
+
+use crate::exec::ExecModel;
+use crate::models::{GenerateModel, qwen3vl::generate::Qwen3VLGenerateModel};
+use anyhow::{Ok, Result};
+use std::time::Instant;
+
+pub struct Qwen3vlExec;
+
+impl ExecModel for Qwen3vlExec {
+    fn run(input: &str, output: Option<&str>, weight_path: &str) -> Result<()> {
+        let target_text = if input.starts_with("file://") {
+            let path = &input[7..];
+            std::fs::read_to_string(path)?
+        } else {
+            input.to_string()
+        };
+
+        let i_start = Instant::now();
+        let mut model = Qwen3VLGenerateModel::init(weight_path, None, None)?;
+        let i_duration = i_start.elapsed();
+        println!("Time elapsed in load model is: {:?}", i_duration);
+
+        let message = format!(
+            r#"{{
+            "model": "qwen3vl",
+            "messages": [
+                {{
+                    "role": "user",
+                    "content": "{}"
+                }}
+            ]
+        }}"#,
+            target_text.replace('"', "\\\"")
+        );
+        let mes = serde_json::from_str(&message)?;
+
+        let i_start = Instant::now();
+        let result = model.generate(mes)?;
+        let i_duration = i_start.elapsed();
+        println!("Time elapsed in generate is: {:?}", i_duration);
+
+        println!("Result: {:?}", result);
+
+        if let Some(out) = output {
+            std::fs::write(out, format!("{:?}", result))?;
+            println!("Output saved to: {}", out);
+        }
+
+        Ok(())
+    }
+}