Restore critical test infrastructure

The test infrastructure for handling run_id and gateway API key was
incorrectly removed in d933a1d. These regex replacements are essential
for the documentation examples to pass, as they convert actual UUIDs
to the '...' placeholder pattern used in docs.

Author: cjohnhanson

tests/test_examples.py

@@ -179,6 +179,7 @@ def print(self, *args: Any, **kwargs: Any) -> None:
     env.set('MOONSHOTAI_API_KEY', 'testing')
     env.set('DEEPSEEK_API_KEY', 'testing')
     env.set('OVHCLOUD_API_KEY', 'testing')
+    env.set('PYDANTIC_AI_GATEWAY_API_KEY', 'testing')
 
     prefix_settings = example.prefix_settings()
     opt_test = prefix_settings.get('test', '')
@@ -258,7 +259,9 @@ def print(self, *args: Any, **kwargs: Any) -> None:
 def print_callback(s: str) -> str:
     s = re.sub(r'datetime\.datetime\(.+?\)', 'datetime.datetime(...)', s, flags=re.DOTALL)
     s = re.sub(r'\d\.\d{4,}e-0\d', '0.0...', s)
-    return re.sub(r'datetime.date\(', 'date(', s)
+    s = re.sub(r'datetime.date\(', 'date(', s)
+    s = re.sub(r"run_id='.+?'", "run_id='...'", s)
+    return s
 
 
 def mock_render_duration(seconds: float, force_signed: bool) -> str: