fix: eprintln for Docker logs, include migrations in stub build

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/colony/src/main.rs

@@ -17,19 +17,21 @@ async fn main() {
         .await
         .expect("Failed to connect to database");
 
+    eprintln!("colony: connected to {}", db_url);
+
     // Enable WAL mode
     sqlx::query("PRAGMA journal_mode=WAL")
         .execute(&pool)
         .await
         .unwrap();
 
-    // Run migrations using sqlx's proper migration system
+    // Run embedded migrations
     sqlx::migrate!("./migrations")
         .run(&pool)
         .await
         .expect("Failed to run migrations");
 
-    println!("Colony running on port {}", port);
+    eprintln!("colony: migrations done, starting on port {}", port);
 
     let app = Router::new()
         .route("/api/health", get(routes::health))