Gaze first: plan, and tools for the headset tests

docs/gaze-first.md is the plan agreed on 2026-09-30: with gaze on and no
game, the gaze drives the 3D pointer everywhere, either trigger clicks
where you look (tap, precision by hand movement, hold to drag), and the
controllers keep everything but their lasers.

For its four tests:
- The driver takes "role treadmill", and its compositor bindings repeat
  the right hand's under /user/treadmill. They're additive, so nothing
  changes while the device is a hand. POINTER_ROLE accepts treadmill.
- pointer/probe/lasertest follows who has the dashboard laser and the
  controllers' roles, and with --snapback takes the laser back.
- input/vrws.py reads vrserver's web socket with the standard library
  (the host's Python has no websockets module) and prints component
  changes and update rates. Checked: it connects, and lists the
  controllers' bumper, thumbstick axes, and Steam button, and the
  headset's /proximity, which flickers off for 0.3-0.5 s while worn.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pointer/driver/ft_pointer/resources/input/ft_pointer_vrcompositor.json

@@ -82,6 +82,42 @@
 							"output": "/actions/lasermouse/in/back"
 						}
 					}
+				},
+				{
+					"path": "/user/treadmill/input/trigger",
+					"mode": "button",
+					"inputs": {
+						"click": {
+							"output": "/actions/lasermouse/in/leftclick"
+						}
+					}
+				},
+				{
+					"path": "/user/treadmill/input/b",
+					"mode": "button",
+					"inputs": {
+						"click": {
+							"output": "/actions/lasermouse/in/rightclick"
+						}
+					}
+				},
+				{
+					"path": "/user/treadmill/input/x",
+					"mode": "button",
+					"inputs": {
+						"click": {
+							"output": "/actions/lasermouse/in/middleclick"
+						}
+					}
+				},
+				{
+					"path": "/user/treadmill/input/joystick",
+					"mode": "button",
+					"inputs": {
+						"click": {
+							"output": "/actions/lasermouse/in/back"
+						}
+					}
 				}
 			],
 			"poses": [
@@ -92,6 +128,10 @@
 				{
 					"output": "/actions/lasermouse/in/Pointer",
 					"path": "/user/hand/right/pose/raw"
+				},
+				{
+					"output": "/actions/lasermouse/in/Pointer",
+					"path": "/user/treadmill/pose/raw"
 				}
 			]
 		},
@@ -114,6 +154,15 @@
 							"output": "/actions/scroll_discrete/in/scroll"
 						}
 					}
+				},
+				{
+					"path": "/user/treadmill/input/joystick",
+					"mode": "scroll",
+					"inputs": {
+						"scroll": {
+							"output": "/actions/scroll_discrete/in/scroll"
+						}
+					}
 				}
 			]
 		},
@@ -136,6 +185,15 @@
 							"output": "/actions/scroll_smooth/in/scroll"
 						}
 					}
+				},
+				{
+					"path": "/user/treadmill/input/joystick",
+					"mode": "scroll",
+					"inputs": {
+						"scroll": {
+							"output": "/actions/scroll_smooth/in/scroll"
+						}
+					}
 				}
 			]
 		},
@@ -158,6 +216,15 @@
 							"output": "/actions/system/in/ToggleDashboard"
 						}
 					}
+				},
+				{
+					"path": "/user/treadmill/input/system",
+					"mode": "button",
+					"inputs": {
+						"click": {
+							"output": "/actions/system/in/ToggleDashboard"
+						}
+					}
 				}
 			]
 		},
@@ -198,6 +265,24 @@
 							"output": "/actions/lasermouse_secondary/in/switchlaserhand"
 						}
 					}
+				},
+				{
+					"path": "/user/treadmill/input/trigger",
+					"mode": "button",
+					"inputs": {
+						"click": {
+							"output": "/actions/lasermouse_secondary/in/switchlaserhand"
+						}
+					}
+				},
+				{
+					"path": "/user/treadmill/input/a",
+					"mode": "button",
+					"inputs": {
+						"click": {
+							"output": "/actions/lasermouse_secondary/in/switchlaserhand"
+						}
+					}
 				}
 			]
 		}