FX.66 Wall + Move / Copy: a moved or copied group of rooms does not stretch the joined walls outside the group

Wall tool spec page 9, 'How other tools combine with the wall' (Duncan, 2026-11-05), tracked at /roadmap-internal 'BimCraft wall tool specification'. Code checked in the a Discord member source 2026-11-05. Spec: move or copy a group of rooms and every joined wall outside the group stretches to stay joined (Place in space -> Join solver -> Follow; today Partly). Cause, from reading: Move is carryJoined: false (FX.62), and a copy goes through addWall (model-modify.js), so the copied walls are new walls that are not joined to anything outside the group, and nothing stretches. Wanted: Move stretches the outside neighbours (their ends slide along their own line, FX.63 / FX.60); Copy leaves the originals alone and makes the copies joined among themselves. Acceptance: spec test 1 style on a two-room plan, one undo step. OTHER APPS: CadCraft plan walls Move already follows joins (FX.59 notes the turning problem); Copy there is not checked. Not started.

walls-09 2026-11-06: Checked, no code change needed after FX.62: a Move of a group of walls (one room of two) keeps the group's corners and the walls outside stay joined; Copy leaves the originals and the copies are joined among themselves (two corners). One undo step. Test: node bin/test-bimcraft.mjs --walltools (FX.66 block). Real page: the Move tool's group move was not driven in a browser by this session.