NX Loom 0.25.0 — the seam stops fighting back

You said working near the symmetry line was annoying. It was worse than
annoying — the mirrored half was a trap, three ways:

• Zombie arcs. Erase a mirrored arc, and the next sync regenerated it.
  Every destructive gesture on the mirrored half — erase, dissolve, merge,
  retype, select — now redirects to its authored source. Both halves go, and
  they stay gone.
• Reverting drags. Move a mirrored node and it held… until some later
  edit regenerated the mirror and silently threw your move away. Dragging the
  mirrored half now drives the authored source with the reflected position —
  your side follows live, and the move is permanent.
• Decaying strokes. Drawing attached to mirrored geometry quietly fell
  apart into stubs that fought the next sync. Strokes are now reflected
  wholesale and committed on the authored side; sync mirrors them back to
  exactly where you drew. Verified: zero unpaired arcs afterwards.

In short: either half is now the document. Draw, erase, drag, merge on
whichever side is facing you.

And the seam snap learned manners: Snap to Seam can be toggled off in the
Symmetry panel, and Ctrl-click bypasses it for a single click — so you can
place geometry deliberately close to the middle without being yanked onto it.

395 headless checks + 16 GUI checks; the 122-layout sweep is clean.