chore: enhance RTL style checks and enforce naming conventions

- Updated  to enforce stricter naming rules for new owned RTL.
- Expanded documentation on RTL coding style to include detailed naming contracts.
- Refactored RTL code to comply with new naming conventions, including:
  - Renaming typedefs to use  suffix for enums and  for other types.
  - Ensuring module names use lower snake case and ports have appropriate direction suffixes.
  - Adjusting instance names to start with  and ensuring state variables use  and  suffixes.
- Modified scripts to include checks for new naming rules and updated tests to validate these changes.
- Updated  to reflect new naming guidelines and exceptions.

tests/test_user_extensions.py

@@ -54,7 +54,7 @@ def test_extensions_generate_isolated_scalar_bindings(tmp_path: Path) -> None:
     assert core.count("ribp2rib #(") == 6
     assert core.count(".SYNC_RESET(1'b1)") == 3
     assert core.count(".SYNC_RESET(1'b0)") == 3
-    assert "rib.cmd_valid = '0;" in core
+    assert "u_user_rib_if.cmd_valid = '0;" in core
     assert "5'd0: begin" in core
     assert "5'd4: begin" in core
     assert "5'd5: begin" in core