v1.50.2: the v1.50.1 review (HP-1501-01, HP-1501-02)

- HP-1501-01: v1.50.1 bounded layout positions and left room rectangles,
  polygon vertices, view_box and opening coordinates on bare _finite — the
  same absurd-magnitude failure, one schema over. _GEOM (±4) covers them all
  now, opening angles get ±360. And because a store may already hold such a
  vertex from before the door existed, contentBounds applies its canvas
  envelope to room geometry exactly as it does to device positions: the
  point renders where it is, the frame ignores it, a space of nothing but
  absurd points falls back to the whole canvas.
- HP-1501-02: a repair matching zero positions answered ok/moved:0 and
  replaced the one-deep backup with an empty one — a typo right after
  repairing the wrong space destroyed the promised way back. Empty match is
  nothing_to_repair now: no write, no revision bump, backup intact.

Old test fixtures carried view_box [0,0,100,100] from the render-unit days;
they now use the normalised box the product actually stores.

docs/TESTING.md

@@ -239,6 +239,13 @@ Run the *core flows* (marked ★ below) in each environment at least once per mi
       on the plan after a reload. Same for each tap action and each fill mode
       [auto: backend test_every_display_mode_the_editor_offers_is_accepted and
       neighbours, test_a_marker_showing_its_value_can_be_saved]
+- [ ] Geometry bounds (v1.50.2, HP-1501-01): a config with a 1e100 room
+      vertex is refused by the server; one already stored still renders with a
+      sane frame [auto: test_geometry_magnitudes_are_bounded + unit
+      contentBounds legacy case]
+- [ ] No-op repair (v1.50.2, HP-1501-02): geometry/repair with a typo'd space
+      id errors, moves no revision and keeps the previous backup undoable
+      [auto: test_a_noop_repair_does_not_eat_the_backup]
 - [ ] Card below other dashboard content (v1.50.1, HP-1500-02): place the card
       after a tall card in a normal dashboard — the plan still gets most of the
       viewport instead of a zero-height stage [auto: smoke_zoom_out]