Add Transition Configurator plugin for easy exit configuration

Features:
- Fuzzy search for finding destination rooms
- Lists all TransitionPieces in selected room as arrival points
- Bidirectional wiring - updates return transition automatically
- Auto-reloads destination scene in editor
- UndoRedo support for source scene changes

Files added:
- addons/transition_configurator/plugin.cfg
- addons/transition_configurator/transition_configurator.gd
- addons/transition_configurator/transition_inspector_plugin.gd
- addons/transition_configurator/config_dialog.gd
- addons/transition_configurator/fuzzy_search.gd
- addons/transition_configurator/README.md

addons/transition_configurator/transition_configurator.gd

@@ -0,0 +1,14 @@
+@tool
+extends EditorPlugin
+
+const INSPECTOR_PLUGIN = preload("res://addons/transition_configurator/transition_inspector_plugin.gd")
+
+var inspector_plugin: EditorInspectorPlugin
+
+func _enter_tree() -> void:
+	inspector_plugin = INSPECTOR_PLUGIN.new()
+	add_inspector_plugin(inspector_plugin)
+
+func _exit_tree() -> void:
+	remove_inspector_plugin(inspector_plugin)
+	inspector_plugin = null