Phase 1 mid-review + stress harness

- docs/MIDREVIEW.md: what M0'-M2.5 proved, bridge-layer LOC (~1100),
  key technical conclusions (4x4 transpose, animation method B, no
  handedness flip needed), remaining risks, recommendation = enter Phase 2
  with a 3-item wrap-up (compare.py, dump_materials oracle, refocused perf).
- harness MTGODOT_STRESS=N: grid of N animated warriors, vsync off, dumps
  test/godot-macos-stress.json. Frame times are throttle-capped in a
  background window (~30fps to 50 chars, 52ms at 100); the reliable signals
  are build cost ~165ms/char and the 100-char breakout.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WaHYEY9rwLWt21PULiYjeJ

project/main.gd

@@ -31,6 +31,12 @@ func _ready() -> void:
 	_build_environment()
 	_build_sun()
 	_build_camera()
+
+	var stress := OS.get_environment("MTGODOT_STRESS")
+	if stress != "":
+		await _run_stress(int(stress))
+		return
+
 	_load_content()
 	_frame_model()
 	print("[mtgodot] harness ready")
@@ -197,6 +203,80 @@ func _on_key(kc: int) -> void:
 				_anim.call("set_time", _anim.call("get_time") + 0.05)
 
 
+## MTGODOT_STRESS=N : spawn N animated warriors in a grid, measure frame time
+## over ~180 frames, write test/godot-macos-stress.json, quit.
+## Feeds the Phase-2 animation A/B (per-frame set_bone_global_pose vs baked).
+func _run_stress(n: int) -> void:
+	DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
+	Engine.max_fps = 0
+	var model_path := _assets_root.path_join("PC/ymir work/pc/warrior/warrior_cheongrin.gr2")
+	var tex_dir := _assets_root.path_join("PC/ymir work/pc/warrior")
+	var anim_path := _assets_root.path_join("PC/ymir work/pc/warrior/action/dance_1.gr2")
+	var cols := int(ceil(sqrt(float(n))))
+	var t_build_start := Time.get_ticks_usec()
+	for i in n:
+		var m: Node3D = ClassDB.instantiate("Metin2Model")
+		m.name = "M%d" % i
+		m.set("texture_dir", tex_dir)
+		m.set("gr2_path", model_path)
+		m.position = Vector3((i % cols) * 1.2 - cols * 0.6, 0, (i / cols) * 1.2)
+		add_child(m)
+		var a: Node3D = ClassDB.instantiate("Metin2AnimPlayer")
+		a.set("model_path", NodePath("../M%d" % i))
+		a.set("anim_path", anim_path)
+		a.set("time_scale", 1.0 + 0.01 * i)  # desync
+		add_child(a)
+		a.call("reload")
+		a.call("set_time", 0.13 * i)
+	var build_ms := (Time.get_ticks_usec() - t_build_start) / 1000.0
+
+	_target = Vector3(0, 1.0, cols * 0.6)
+	_dist = cols * 2.2
+	_pitch = 0.35
+	_update_camera()
+
+	# warm-up
+	for i in 40:
+		await get_tree().process_frame
+	var total: Array[float] = []
+	var proc: Array[float] = []
+	for i in 240:
+		await get_tree().process_frame
+		total.append(1000.0 / maxf(Engine.get_frames_per_second(), 1.0))
+		proc.append(Performance.get_monitor(Performance.TIME_PROCESS) * 1000.0)
+	total.sort()
+	proc.sort()
+	var tsum := 0.0
+	for s in total:
+		tsum += s
+	var psum := 0.0
+	for s in proc:
+		psum += s
+	var report := {
+		"characters": n,
+		"build_ms_total": build_ms,
+		"build_ms_per_char": build_ms / n,
+		"frames": total.size(),
+		"frame_ms_avg": tsum / total.size(),
+		"frame_ms_p95": total[int(total.size() * 0.95)],
+		"frame_ms_max": total[-1],
+		"fps_avg": 1000.0 / (tsum / total.size()),
+		"cpu_process_ms_avg": psum / proc.size(),
+		"cpu_process_ms_p95": proc[int(proc.size() * 0.95)],
+		"renderer": RenderingServer.get_video_adapter_name(),
+		"method": "per-frame set_bone_global_pose (B)",
+	}
+	var out := OS.get_environment("MTGODOT_STRESS_OUT")
+	if out == "":
+		out = ProjectSettings.globalize_path("res://../test/godot-macos-stress.json")
+	var f := FileAccess.open(out, FileAccess.WRITE)
+	if f:
+		f.store_string(JSON.stringify(report, "  "))
+		f.close()
+	print("[mtgodot] stress ", n, " -> ", report)
+	get_tree().quit()
+
+
 func _screenshot() -> void:
 	var img := get_viewport().get_texture().get_image()
 	var path := "user://shot_%d.png" % Time.get_ticks_msec()