wip(gate): request the support tile at once; no gate timeout -- stress criteria NOT trusted yet

- RequestCollisionGateSupportTile submits the level-0 support tile immediately, even before the
  first desired set; the desired rebuild adopts the same pending key (1 early request, 1 adoption,
  1 ready callback in all 10 runs). First check -> submit went from ~2.2 s to ~1 us.
- The 2 s gate release timeout is removed: at the owner's startup the game thread applies nothing
  for ~2.2 s, so the timeout always fired and dropped the pawn. The gate holds downward Z only;
  horizontal movement stays free.
- Controls (previous round): legacy selector+reconcile failed the stress repro 0/5, aligned 1/5,
  so 85a803b did not regress the gate.

NOT VALIDATED: the stress repro's pass criteria were rewritten (support submitted/ready, a hold,
progress during a hold). 10/10 "pass" under them, but every one of those runs, and the gate-
disabled run, ends stuck at (455.7, 0, -58.1), ~1.55 m below the Z~97-100 at which the old
passing runs travelled 113 m. Whether that spot is a real pit or the pawn below the surface is
unresolved; until it is, a pass under these criteria proves nothing about falling through.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ

Tools/VoxelForgeTest.ps1

@@ -992,7 +992,9 @@ function Get-CollisionGateStressMetrics([string]$LogPath) {
     if ($result.Success -and $result.Groups['v'].Value -eq 'PASS') { $metrics.status = 'passed' }
     foreach ($key in @('reason', 'elapsed_s', 'distance_m', 'expected_distance_m', 'speed_cm_s',
                         'gate_holds', 'gate_total_s', 'max_gate_s', 'full_stops',
-                        'full_stop_total_s', 'collision_gate')) {
+                        'full_stop_total_s', 'collision_gate', 'gate_progress_m', 'support_tile',
+                        'support_first_check_to_submit_s',
+                        'support_first_check_to_collision_ready_s')) {
         $match = [regex]::Match($line, ('{0}=(?<v>[^ ]+)' -f $key))
         if ($match.Success) { $metrics[$key] = $match.Groups['v'].Value }
     }