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- Vertical oblique projection: the floor matrix is the identity and a height rises straight up by z·sin 20°, so the on-screen wall height is unchanged and the cos 20° foreshortening of the plan, decor and anchors is gone. - Device tiles and lock badges stand on the wall-top plane with one common shift; the #651 placement search no longer runs in the live scene (its removal is #714). Room names keep their Flat floor point. - The 2.5D fit no longer reserves the 48 CSS px nudge budget. - Switching projection keeps the camera when the previous projection was on screen: saving the setting, entering an editor from 2.5D and adopting a warm memo from the other projection re-read only the scalar zoom. A cold 2.5D start still opens the 2.5D home. - Opening faces are ordered along the oblique projector (s·y + z). Witness: demo/smoke_iso_flat_parity.mjs (AC2–AC5, AC11) is red on the old code. Issue: #713 User-Visible: yes Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd