fix(main): remove duplicate ModelCommands enum definition

A duplicate ModelCommands enum was introduced in a recent merge,
causing E0119/E0428 compile errors on CI (Rust 1.92).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main.rs

@@ -272,20 +272,6 @@ enum ModelCommands {
     },
 }
 
-#[derive(Subcommand, Debug)]
-enum ModelCommands {
-    /// Refresh and cache provider models
-    Refresh {
-        /// Provider name (defaults to configured default provider)
-        #[arg(long)]
-        provider: Option<String>,
-
-        /// Force live refresh and ignore fresh cache
-        #[arg(long)]
-        force: bool,
-    },
-}
-
 #[derive(Subcommand, Debug)]
 enum ChannelCommands {
     /// List configured channels

src/tools/git_operations.rs

@@ -555,7 +555,6 @@ impl Tool for GitOperationsTool {
 mod tests {
     use super::*;
     use crate::security::SecurityPolicy;
-    use std::path::Path;
     use tempfile::TempDir;
 
     fn test_tool(dir: &std::path::Path) -> GitOperationsTool {