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

README.md

@@ -32,9 +32,12 @@
   opaque/alpha/alpha-test/add 四模式）+ 目录扫描贴图解析 + 方向光阴影 + procedural sky
   + 引擎雾（`test/golden/m25-*.png`）。**门禁未闭**：多材质槽 → 贴图/混合的精确映射需
   给 libgr2 加材质 API（见 `docs/GODOT-POC-PLAN.md` §M2.5 T2.5.6 差距清单）。
-- [ ] **中期评审** — 待 M2.5 门禁 + 对拍报告
+- [~] **中期评审** — [`docs/MIDREVIEW.md`](docs/MIDREVIEW.md)。结论：桥接层工程量小、
+  风险基本出清，**建议进入 Phase 2**。收尾 3 项：`compare.py` 对拍、`dump_materials`
+  Granny 对拍闭合 M2.5 门禁、前台/真机性能重测。
 
-对拍（与 `xrender-poc` bgfx demo / oracle 逐帧）尚未接线，是中期评审前的下一步。
+50 角色压力采样：`test/godot-macos-stress.json`（后台窗口 30fps 节流，仅构建成本
+~165ms/角色 和 100 角色破顶到 52ms 是可信信号）。
 
 ---