Un-nest used to require holding Alt (or Cmd to force-detach). That
was too conservative — when a user dragged a child clearly outside
its parent's bbox, nothing happened on release, because the default
branch soft-clamped back and only the Alt branch actually opened
the "Extract?" confirm. Matches the exact bug the user just flagged
("I can put agents in other agent, but when I drag it out, it does
not move out").
New rules:
* Past the 20 % hysteresis → confirm un-nest. Plain drag, no
modifier. This is what most users expect (Miro / Figma behave
the same way — drag outside the frame and the shape leaves it).
* Inside or within 20 % of the edge → soft-clamp back inside.
Guards against twitchy releases that momentarily overshoot the
edge by a few pixels.
* Cmd / Ctrl → force un-nest regardless of overlap. Escape-hatch
for when the user dragged within the hysteresis zone but really
wants out.
* Dropping onto a different parent → nest there (unchanged).
Alt is no longer a required modifier for un-nesting. Keeps it as
a non-gesture modifier only; no meaning unless we re-bind it later.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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