Save The Tree implementation and acceptance work in progress

Preserve production code, regression fixtures, audio assets and provenance, test infrastructure, and the original-completion plan and progress ledger. Final game and Windows acceptance remain pending; excluded local artifacts and native experiments are not part of this snapshot.

assets/audio/bgm/tree_theme_back_candidate.wav.import

@@ -0,0 +1,24 @@
+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://qpe5mfy3o1cw"
+path="res://.godot/imported/tree_theme_back_candidate.wav-1af8eac19cfe5ccb9a16a9a74b171ffd.sample"
+
+[deps]
+
+source_file="res://assets/audio/bgm/tree_theme_back_candidate.wav"
+dest_files=["res://.godot/imported/tree_theme_back_candidate.wav-1af8eac19cfe5ccb9a16a9a74b171ffd.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=0

assets/audio/bgm/tree_theme_front_candidate.wav.import

@@ -0,0 +1,24 @@
+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://dr4atdrw3iv1o"
+path="res://.godot/imported/tree_theme_front_candidate.wav-dd40d47f468b616e1eb3517c0056cc0c.sample"
+
+[deps]
+
+source_file="res://assets/audio/bgm/tree_theme_front_candidate.wav"
+dest_files=["res://.godot/imported/tree_theme_front_candidate.wav-dd40d47f468b616e1eb3517c0056cc0c.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=0