Upgrade MyGo to v0.5.5

Elements are now pass-scoped value handles: tests that read bounds
after a frame bind a ui.Handle. pixel tells frames apart by the build
pass's root, since the Tester clock no longer moves on its own.

Fix the regressions the upgrade brought:
- Clipboard reads in input handlers go through c.Services().
- MyGo notes an overlay's opener after building it, so AutoFocus
  inside lost it; pixel.AutoFocus focuses through a Handle, and
  archtest bans the raw call. Dialogs hand the focus back again.
- Elements around a press stay hovered: Tooltip tells a press-given
  focus by focus arriving under the pointer.
- The web host moves the Tester clock with real time, at most 500 ms
  a call, and gives components the real clock.

The gallery's source index also accepts CRLF checkouts.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

game/rewards_test.go

@@ -262,7 +262,7 @@ func TestGachaReelRefusesAFaceWithoutSprite(t *testing.T) {
 }
 
 func TestInteractPromptSitsAboveItsTarget(t *testing.T) {
-	var target *ui.Element
+	var target ui.Element
 	pad := 40
 	tt := view(400, 300, &world{clk: newClock(), reduce: true}, func(c *ui.Context) {
 		ui.Column(c).Padding(pixel.K(c).D(pad)).Children(func() {