fix: guard __main__ for Space (pySpaces handles launch)

app.py

@@ -13,6 +13,7 @@ never crashes. Run: `ollama serve` + `make run` (= `uv run python app.py`).
 
 from __future__ import annotations
 
+import os
 import random
 
 import gradio as gr
@@ -460,6 +461,6 @@ def build() -> gr.Blocks:
 
 demo = build()
 
-if __name__ == "__main__":
+if __name__ == "__main__" and not os.environ.get("SPACE_ID"):
     print(f"[chief-engineer] {llm.backend_status()} | seeded {_loaded} lessons this run")
     demo.queue().launch(theme=THEME, css=CSS, head=VP_HEAD, server_name="0.0.0.0", server_port=7860)