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/example_provider.py

@@ -1,4 +1,4 @@
-"""Example provider that uses the new `ResultTable` API.
+"""Example plugin that uses the new `ResultTable` API.
 
 This module demonstrates a minimal provider adapter that yields `ResultModel`
 instances, a set of `ColumnSpec` definitions, and a tiny CLI-friendly renderer
@@ -8,7 +8,7 @@ Run this to see sample output:
     python -m Provider.example_provider
 
 Example usage (piped selector):
-    provider-table -provider example -sample | select -select 1 | add-file -store default
+    plugin-table -plugin example -sample | select -select 1 | add-file -store default
 """
 from __future__ import annotations
 
@@ -105,9 +105,9 @@ def selection_fn(row: ResultModel) -> List[str]:
     return ["-title", row.title]
 
 
-# Register the provider with the registry so callers can discover it by name
-from SYS.result_table_adapters import register_provider
-register_provider(
+# Register the plugin with the registry so callers can discover it by name
+from SYS.result_table_adapters import register_plugin
+register_plugin(
     "example",
     adapter,
     columns=columns_factory,
@@ -223,17 +223,17 @@ def demo() -> None:
 
 
 def demo_with_selection(idx: int = 0) -> None:
-    """Demonstrate how a cmdlet would use provider registration and selection args.
+    """Demonstrate how a cmdlet would use plugin registration and selection args.
 
-    - Fetch the registered provider by name
+    - Fetch the registered plugin by name
     - Build rows via adapter
     - Render the table
     - Show the selection args for the chosen row; these are the args a cmdlet
       would append when the user picks that row.
     """
-    from SYS.result_table_adapters import get_provider
+    from SYS.result_table_adapters import get_plugin
 
-    provider = get_provider("example")
+    provider = get_plugin("example")
     rows = list(provider.adapter(SAMPLE_ITEMS))
     cols = provider.get_columns(rows)