User decision 2026-04-24 : IDLE bindings must be supported because
modders need to define idle poses for their items (armbinder can't
work without arms-behind-back idle pose). TiedUp will also ship
default IDLE bindings for its core items once assets are authored.
Technical : EF ClientAnimator has 2 separate maps (livingAnimations
for BASE layer + compositeLivingAnimations for COMPOSITE layers).
Both support IDLE bindings without race — last-put-wins for base
override, or automatic composition via JointMask for partial overlay.
The previous WARN was a reviewer over-correction based on misread
of the 2-map structure.
- Removed WARN parse-time in DataDrivenItemParser.parseAnimationBindings
- Updated test : IDLE binding is accepted silently (no warn)
- Cleaned 'Option B' mentions in javadoc comments
- Design doc (gitignored) updated with 2-path explanation.
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