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Audit dev@2c947f4, DEV-2C947-02 (P2). Move the only room from 0.1..0.9 to 5.1..5.9 inside the Plan editor and go back to View: the frame stayed 5880 units wide instead of the room's 880, and only a manual `_frame = null` put it right. Anything that moves, deletes or heavily resizes geometry in an editor left View looking at ground the plan no longer occupies — until some unrelated model/layout/device change happened to invalidate the memo. The growth itself is deliberate and stays (docs/CANVAS.md §4.3): inside an editor the frame bounds pan and defines what zoom 1 means, and one that shrank the instant a room was deleted would move the ground under a live gesture. The bug was that the growth was invisible to the memo — `_frame`'s key carried the space, the model, the layout, the devices and the show-far flag, but not the mode, so the accumulated union was handed straight back in View. `grow` (`_mode !== 'view'`) is now part of the key, and the union is only ever taken against a frame the same editor session produced. Leaving an editor recomputes from the content; entering one starts from the current geometry instead of resurrecting the union of a previous session. smoke_canvas_frame.mjs grows the auditor's scenario: the frame before, the union inside the editor (asserted, so the growth cannot be "fixed" by deleting it), the frame after exit — 5060..5940 — and re-entry. Two checks are red on the parent commit.