feat(viz): m key = matrix mode, fix test pins

m now stops the auto data-synth scene AND forces the openpos viz
(matrix unaffected — it is not a scene). Repairs the two test pins the
frozen pinch defaults broke (ext_min 1) and makes the skeleton path
safe for __new__-built renderers (hand gate getattr).

data_only_viz/main.py

@@ -621,7 +621,21 @@ class AppDelegate(NSObject):
                     self._user_viz_lock_t = _t.monotonic()
                     LOG.info("[video] viz -> %s (%d) (lock 8s)", name, idx)
                 return None
-        # qsdfghjklm -> audio (scene SC)
+        # m = matrix performance mode: stop the auto data-synth scene AND
+        # force the openpos viz (the matrix is not a scene — it keeps
+        # playing). User request live 2026-07-02.
+        if k == "m":
+            self._scClient.send_message("/control/doScene", ["stop"])
+            names = list(self._state.viz_mode_names)
+            idx = names.index("openpos") if "openpos" in names else 0
+            with self._state.lock():
+                self._state.viz_mode = idx
+                self._state.active_scene = "stop"
+            import time as _t
+            self._user_viz_lock_t = _t.monotonic()
+            LOG.info("[key] m -> scene stop + viz openpos (matrix mode)")
+            return None
+        # qsdfghjkl -> audio (scene SC)
         for kk, scene in KEYMAP_AUDIO:
             if k == kk:
                 self._scClient.send_message("/control/doScene", [scene])

data_only_viz/renderer.py

@@ -407,7 +407,10 @@ class MetalRenderer(NSObject):
 
         # Gate called once per frame on the full persons_hands list.
         # Used for both the overlay loop and the side panels below.
-        _hand_draw_flags = self._hand_gate.step(s.persons_hands)
+        # getattr: unit tests build the renderer via __new__ (no Metal init).
+        _gate = getattr(self, "_hand_gate", None)
+        _hand_draw_flags = (_gate.step(s.persons_hands) if _gate is not None
+                            else [True] * len(s.persons_hands))
 
         if use_arkit:
             parents = s.arkit_parents

data_only_viz/tests/test_action_head_finger_emit.py

@@ -141,7 +141,7 @@ def test_pinch_gate_env_defaults_are_strict(monkeypatch):
         monkeypatch.delenv(k, raising=False)
     pub = _pub_envs(monkeypatch, finger_piano="0", pinch_enable="1")
     assert pub._pinch_det.ext_ratio == 1.35
-    assert pub._pinch_det.ext_min == 2
+    assert pub._pinch_det.ext_min == 1   # 1 since 2026-07-02 (inner-finger fix)
     assert pub._pinch_det.debounce_frames == 3