feat(common): sports consolidation stage 4 -- the identical sweep (plugin host, live scroll, display rules, font path) (#705)

Moves the code every scoreboard plugin carries identically into core: src.common.sports_plugin_host, sports_live_scroll, sports_display_rules and sports_font_path, with unit tests and a parity test against the ledmatrix-plugins copies (LEDMATRIX_PLUGINS).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/sports_drift_report.py

@@ -140,6 +140,14 @@ class _Canonical(ast.NodeTransformer):
         node.annotation = None
         return node
 
+    def visit_AnnAssign(self, node):
+        # ``x: T = v`` is ``x = v``; a bare ``x: T`` does nothing at runtime.
+        self.generic_visit(node)
+        if node.value is None:
+            return None
+        return ast.copy_location(
+            ast.Assign(targets=[node.target], value=node.value), node)
+
 
 class _Folded(_Canonical):
     """Canonical, plus sport names folded out of identifiers and strings."""