feat: add ecc2 worktree auto-merge policy

ecc2/src/config/mod.rs

@@ -31,6 +31,7 @@ pub struct Config {
     pub default_agent: String,
     pub auto_dispatch_unread_handoffs: bool,
     pub auto_dispatch_limit_per_session: usize,
+    pub auto_merge_ready_worktrees: bool,
     pub cost_budget_usd: f64,
     pub token_budget: u64,
     pub theme: Theme,
@@ -57,6 +58,7 @@ impl Default for Config {
             default_agent: "claude".to_string(),
             auto_dispatch_unread_handoffs: false,
             auto_dispatch_limit_per_session: 5,
+            auto_merge_ready_worktrees: false,
             cost_budget_usd: 10.0,
             token_budget: 500_000,
             theme: Theme::Dark,
@@ -154,6 +156,10 @@ theme = "Dark"
             config.auto_dispatch_limit_per_session,
             defaults.auto_dispatch_limit_per_session
         );
+        assert_eq!(
+            config.auto_merge_ready_worktrees,
+            defaults.auto_merge_ready_worktrees
+        );
     }
 
     #[test]
@@ -174,11 +180,12 @@ theme = "Dark"
     }
 
     #[test]
-    fn save_round_trips_auto_dispatch_settings() {
+    fn save_round_trips_automation_settings() {
         let path = std::env::temp_dir().join(format!("ecc2-config-{}.toml", Uuid::new_v4()));
         let mut config = Config::default();
         config.auto_dispatch_unread_handoffs = true;
         config.auto_dispatch_limit_per_session = 9;
+        config.auto_merge_ready_worktrees = true;
 
         config.save_to_path(&path).unwrap();
         let content = std::fs::read_to_string(&path).unwrap();
@@ -186,6 +193,7 @@ theme = "Dark"
 
         assert!(loaded.auto_dispatch_unread_handoffs);
         assert_eq!(loaded.auto_dispatch_limit_per_session, 9);
+        assert!(loaded.auto_merge_ready_worktrees);
 
         let _ = std::fs::remove_file(path);
     }