fix: rename .generated → generated for easy access

Hidden dot-prefix removed for ergonomic shell navigation.
Still gitignored — build output is user-specific.

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

build.py

@@ -238,7 +238,7 @@ def print_summary(config: dict, total_personas: int, total_variants: int):
     print(f"BUILD COMPLETE")
     print(f"  Personas: {total_personas}")
     print(f"  Variants: {total_variants}")
-    print(f"  Output:   .generated/")
+    print(f"  Output:   generated/")
 
     if config:
         user = config.get("user", {}).get("name", "?")
@@ -264,7 +264,7 @@ def main():
         print("No personas/ directory found.")
         sys.exit(1)
 
-    output_dir = root / ".generated"
+    output_dir = root / "generated"
 
     # Load config
     config = load_config(root)