Agent Mode Enhancements

• Agent prompts are now embedded within the g3 binary
• README.md - Added new "Agent Mode" section documenting:
  • All 7 built-in agents with their focus areas
  • Usage examples (--list-agents, --agent <name>)
  • How to create custom workspace agents

Behavior
1. Workspace agents take priority - If agents/<name>.md exists in the workspace, it's used
2. Embedded fallback - If no workspace agent exists, the embedded version is used
3. Portability - g3 binary now works on any repo without needing the agents/ directory
4. Discoverability - g3 --list-agents shows all available agents and their source

crates/g3-cli/src/lib.rs

@@ -4,6 +4,7 @@ pub mod filter_json;
 pub mod metrics;
 pub mod project_files;
 pub mod streaming_markdown;
+pub mod embedded_agents;
 
 mod accumulative;
 mod agent_mode;
@@ -44,6 +45,22 @@ pub async fn run() -> Result<()> {
         std::process::exit(1);
     }
 
+    // Check if --list-agents was requested
+    if cli.list_agents {
+        let workspace_dir = cli.workspace.clone().unwrap_or_else(|| std::env::current_dir().unwrap_or_default());
+        let agents = embedded_agents::get_available_agents(&workspace_dir);
+        println!("Available agents:");
+        let mut names: Vec<_> = agents.keys().collect();
+        names.sort();
+        for name in names {
+            let source = if agents[name] { "workspace" } else { "embedded" };
+            println!("  {} ({})", name, source);
+        }
+        println!("\nUse: g3 --agent <name> [task]");
+        println!("Workspace agents override embedded agents with the same name.");
+        return Ok(());
+    }
+
     // Check if planning mode is enabled
     if cli.planning {
         let codepath = cli.codepath.clone();