feat(puppet): v0.4.3 — inherit_scale=false flag (decouple world.scl)

New optional bone field 'inherit_scale' (default true). When set false,
world.scl = local.scl (no parent.scl multiplier). Position cascade still
uses parent.scl (so child follows parent's stretch positionally).

Use case: feet that move with leg-end as leg.scl_y cycles +1/0/-1, but
foot sprite stays at constant scale (no Y-flip when leg flips, no
collapse when leg collapses).

manifest.lib

@@ -1,6 +1,6 @@
 {
     "id": "lib-core.puppet",
-    "version": "0.4.2",
+    "version": "0.4.3",
     "api_min": "0.1",
     "deps": []
 }