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.

test/space-geometry.test.mjs

@@ -144,4 +144,24 @@ test('contentBounds: never degenerate, never unbounded (HP-1500-03)', () => {
   // ...but a device a bit past the canvas edge still counts (the gate sensor)
   const near = contentBounds(room, 0.05, [[1100, 500]]);
   assert.ok(near.x + near.w > 1050, 'slightly outside the canvas still stretches the frame');
+
+  // HP-1501-01: the same envelope guards ROOM GEOMETRY — the server refuses
+  // absurd vertices now, but a store may hold one from before that door
+  // existed, and a legacy 1e100 vertex must not frame the plan into a dot
+  const legacy = spaceModels({ spaces: [{
+    id: 's', view_box: [0, 0, 1, 1],
+    rooms: [
+      { id: 'ok', poly: [[0.4, 0.4], [0.6, 0.4], [0.6, 0.6], [0.4, 0.6]] },
+      { id: 'bad', poly: [[0, 0], [1e100, 0], [1, 1]] },
+    ],
+  }], markers: [] })[0];
+  const lb = contentBounds(legacy);
+  assert.ok(lb.w < 1500 && lb.h < 1500, 'the absurd vertex does not command the frame');
+  assert.ok(lb.x <= 400 && lb.x + lb.w >= 600, 'the sane room is still inside it');
+  // a space where EVERY point is absurd falls back to the whole canvas
+  const allBad = spaceModels({ spaces: [{
+    id: 's', view_box: [0, 0, 1, 1],
+    rooms: [{ id: 'b', poly: [[1e100, 1e100], [2e100, 1e100], [2e100, 2e100]] }],
+  }], markers: [] })[0];
+  assert.equal(contentBounds(allBad), null, 'the caller keeps the full canvas');
 });