fix: make supervised pipeline timeout configurable (#185)

tests/test_app_model_lifecycle.py

@@ -13,10 +13,23 @@ def test_active_checkpoint_survives_cleanup_and_remains_chat_recoverable(tmp_pat
     """Exercise app state in isolation from Gradio's import-time worker sockets."""
     script = r'''
 import pathlib
+import os
 import sys
 
 import app
 
+assert app._pipeline_timeout_seconds() == 2700
+os.environ["OBLITERATUS_PIPELINE_TIMEOUT_SECONDS"] = "7200"
+assert app._pipeline_timeout_seconds() == 7200
+os.environ["OBLITERATUS_PIPELINE_TIMEOUT_SECONDS"] = "invalid"
+try:
+    app._pipeline_timeout_seconds()
+except ValueError as error:
+    assert "must be an integer" in str(error)
+else:
+    raise AssertionError("invalid pipeline timeout was accepted")
+os.environ.pop("OBLITERATUS_PIPELINE_TIMEOUT_SECONDS")
+
 theme = app.THEME.to_dict()["theme"]
 assert theme["body_background_fill"] != theme["body_background_fill_dark"]
 assert theme["body_text_color"] != theme["body_text_color_dark"]