- alignGuides/segmentAngle/is45 pure helpers (+2 unit tests, 108);
per-context candidates (room vertices + path pts / other icons /
decor endpoints+corners / other room cards), nearest per axis, max
two guides, dashed accent lines with a source dot
- cursor badge shows length + angle, green on 45deg multiples
- indication only, no magnetism (owner's decision); guides live in
plan/devices/decor, never in View
- smoke_align_guides.mjs (9 checks); TESTING/CHANGELOG same-commit
