Three of this task's defects were cross-layer wiring rather than logic, so they
belong in the spec where the next session will read them, not only in the task's
research notes.
Frontend: a new client spec covering layer ownership (baseline is never written,
preview hides rather than overwrites), why a handle carries only its id, why a
handle's position must derive from the clamped value, the ban on computing inside
a setState updater, and why per-pointermove React state is the wrong owner of
per-frame feedback.
Backend: the left/right convention now states the three places that must agree
and why a sign convention can be wrong on both sides of the wire at once; a table
of the four profile fields the geometry stage actually reads, so nobody builds UI
for interval-scoped editing again before the compiler honours it; and the
save-is-not-applying contract, including that compileFresh must be installed by
every path that sets session.area.
Also records that an identity test cannot catch an ignored editsFile, and that a
regression test is only trustworthy once it has been seen to fail.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
