Bring the docs up to date with the code

- floating-windows.md and profiles.md describe what's built, with what
  isn't listed as such; the plans, phases, and branch notes are gone
- hands-migration.md is gone: the move is done; its open items are in
  hands/README.md's Known issues
- reference.md: Layout & profiles, every action, key combinations,
  floating windows, the gaze pointer, and hand tracking as they are
- design.md gets the KWin findings from floating-windows.md
- README, gaze/README, AGENTS, hazards, gaze-controllers, and the
  example config catch up with gaze, hands, and the stuck-key fix

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

session/frametop.conf.example

@@ -15,6 +15,7 @@ POINTER_IDLE=30    # seconds without mouse use before the controllers get their
 POINTER_WAKE_COUNTS=40     # mouse counts within 1 s needed to wake or re-claim the laser (ignores desk jitter)
 POINTER_CONTROLLER_PICKUP=1 # how hard a controller must move (x 0.35 m/s or 2 rad/s, for 100 ms) to take the laser back; raise it if resting controllers do (0.5 to 5)
 POINTER_DISTANCE=1.5       # metres to the cursor when it isn't on a panel
+POINTER_ROLE=right         # the hand role the pointer's controller takes: right | left | stylus (no hand); with a Frame controller held in that hand, clicks don't land, so pick the other
 POINTER_CURSOR_DEG=0.4     # size of the free-space dot, in degrees
 POINTER_ORIGIN_FRACTION=0.95 # laser starts this far along eye->cursor: its beam is a few cm, SteamVR's hit dot tiny
 POINTER_LASER_WIDTH=0.8    # controller beam width (dashboard.laserRayWidthScale), set once at helper start
@@ -37,7 +38,7 @@ POINTER_GAZE_SHOW=1        # gaze mode, with POINTER_GAZE_DOT=moving: the dot sh
 POINTER_GAZE_MOUSE=precision # gaze mode: the left button holds back its press, the mouse steers, the release clicks (precision) | clicks right away (direct)
 POINTER_HEAD_DEADZONE=0.5  # keyboard clicks at the gaze (Meta+J, Meta+K): degrees the head turns before the held dot moves with it
 POINTER_KEY_TAP=0.25       # keyboard clicks: let go within this (s) and it clicks where the dot was at the press, and tells the gaze tracker it was right
-GAZE_TRACKER=steam         # gaze service: steam = SteamVR's eye tracker | own = our own (gaze/tracker: its frame grabber needs gaze/tracker/install.sh; calibrated in the gaze probe with Own tracker)
+GAZE_TRACKER=steam         # gaze service: steam = SteamVR's eye tracker | own = our own (gaze/tracker: its frame grabber needs gaze/tracker/install.sh; calibrated with Calibrate on Frametop Input Settings' Gaze page)
 GAZE_EYE=auto              # gaze service: eye bias. auto = each eye weighted by how far off it was at your recent nudges | left | right = that eye counts twice
 HANDS_SWAP_SIDES=0         # hand tracking (hands/run.sh install): 1 = the side cameras' names are swapped, which some SteamVR restarts cause (hands/tools/check_sides.py --ring tells)
 HANDS_CPUS=5,6,7           # hand tracking: the CPUs its model threads run on