feat(store): read ledmatrix_min_version, aliases and commit from the registry (#686)

The store reads three optional registry fields: ledmatrix_min_version
(an incompatible install/update is refused before any download, with a
"Needs LEDMatrix X+" card badge), aliases (update/uninstall/reinstall by
registry id find a plugin installed under its manifest id, with registry
proof only), and commit (shown and linked on the store card). An older
plugins.json behaves as before.

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

test/test_plugin_dirs.py

@@ -11,7 +11,8 @@ Callers:
   discovery  PluginManager._scan_directory_for_plugins -> plugin_directories
   pm_get     PluginManager.get_plugin_directory before discovery has run
   loader     PluginLoader.find_plugin_directory (no discovery mapping)
-  store      PluginStoreManager._find_plugin_path
+  store      PluginStoreManager._find_plugin_path (which also tries the ids the
+             registry proves: aliases, plugin_path name; never a bare prefix)
 """
 
 import json
@@ -144,7 +145,9 @@ TABLE = [
     # manifest id != dir name: the manifest finds it; pm_get by prefix
     ("stocks",                    R + "ledmatrix-stocks", R + "ledmatrix-stocks",
                                   R + "ledmatrix-stocks", R + "ledmatrix-stocks"),
-    # ledmatrix- prefix: name-only callers with prefix=True; the store has none
+    # ledmatrix- prefix: name-only callers with prefix=True. The store only
+    # with registry proof (aliases / plugin_path), and none is loaded here;
+    # see test_store_registry_fields.py
     ("legacy",                    None,              R + "ledmatrix-legacy", R + "ledmatrix-legacy", None),
     ("ledmatrix-legacy",          R + "ledmatrix-legacy", R + "ledmatrix-legacy",
                                   R + "ledmatrix-legacy", R + "ledmatrix-legacy"),