fix examples

Author: mosquito

docs/api.md

@@ -123,8 +123,8 @@ class MyApp(argclass.Parser):
 app = MyApp()
 # Use sanitize_secrets=True to auto-remove secret env vars during parsing
 app.parse_args([], sanitize_secrets=True)
-assert str(app.api_key) == "******"  # Masked in string representation
-assert app.api_key == "secret123"    # But actual value is accessible
+assert repr(app.api_key) == "'******'"  # Masked in repr / logs
+assert app.api_key == "secret123"        # But actual value is accessible
 assert "TEST_API_KEY" not in os.environ  # Already removed
 ```
 
@@ -316,11 +316,12 @@ app = MyApp()
 app.parse_args(["--log-level", "debug"])
 assert app.log_level == logging.DEBUG
 
-app.parse_args(["--log-level", "WARNING"])
+app.parse_args(["--log-level", "warning"])
 assert app.log_level == logging.WARNING
 ```
 
-Accepts: `debug`, `info`, `warning`, `error`, `critical` (case-insensitive).
+Accepts the lowercase enum member names: `debug`, `info`, `warning`,
+`error`, `critical`, `notset`.
 
 ```{eval-rst}
 .. autoclass:: argclass.LogLevelEnum

docs/index.md

@@ -57,9 +57,10 @@ class Server(argclass.Parser):
     port: int = 8080
     debug: bool = False
 
-server = Server()
-server.parse_args()
-print(f"Starting server on {server.host}:{server.port}")
+if __name__ == "__main__":
+    server = Server()
+    server.parse_args()
+    print(f"Starting server on {server.host}:{server.port}")
 ```
 
 ```bash

docs/quickstart.md

@@ -19,9 +19,10 @@ class Greeter(argclass.Parser):
     name: str          # Required argument
     count: int = 1     # Optional with default
 
-greeter = Greeter()
-greeter.parse_args()
-print(f"Hello, {greeter.name}!" * greeter.count)
+if __name__ == "__main__":
+    greeter = Greeter()
+    greeter.parse_args()
+    print(f"Hello, {greeter.name}!" * greeter.count)
 ```
 
 ```console

docs/security.md

@@ -447,6 +447,7 @@ Environment variables are often more secure than config files because:
 - Environment variables are process-scoped and not persisted
 
 ```python
+import os
 # Store secrets in environment, not in config.ini
 os.environ["API_KEY"] = "your_secret"  # Set by deployment system
 ```