huge refactor of the entire codebase, with the goal of improving maintainability, readability, and extensibility. This commit includes changes to almost every file in the project, including:

Provider/hello_provider.py

@@ -1,6 +1,6 @@
-"""Example provider template for use as a starter kit.
+"""Example plugin template for use as a starter kit.
 
-This minimal provider demonstrates the typical hooks a provider may implement:
+This minimal plugin demonstrates the typical hooks a plugin may implement:
 - `validate()` to assert it's usable
 - `search()` to return `SearchResult` items
 - `download()` to persist a sample file (useful for local tests)
@@ -17,13 +17,14 @@ from ProviderCore.base import Provider, SearchResult
 
 
 class HelloProvider(Provider):
-    """Very small example provider suitable as a template.
+    """Very small example plugin suitable as a template.
 
     - Table name: `hello`
-    - Usage: `search-file -provider hello "query"`
+    - Usage: `search-file -plugin hello "query"`
     - Selecting a row and piping into `download-file` will call `download()`.
     """
 
+    PLUGIN_NAME = "hello"
     URL = ("hello:",)
     URL_DOMAINS = ()