feat(combat): port retail held weapon parenting

Select the default combat mode from ordered equipped objects so bows request missile stance. Parse CreateObject parent metadata and ParentEvent, then render held objects as separate children composed from setup holding locations and placement frames each animation tick.

docs/plans/2026-05-12-milestones.md

@@ -451,6 +451,9 @@ include dungeons.
   Inventory list) — minimal ImGui surfaces, retail-skin deferred to M5.
 - **L.1c** — Combat animation wiring (draw/sheath, attack swings by
   stance/power/height, hit reactions, evades).
+- **L.1c held-object foundation (implemented 2026-07-11; live gate pending)** — exact
+  equipment-aware default combat mode (bow→Missile, caster→Magic) plus retail
+  CreateObject/ParentEvent child attachment and per-frame hand-follow rendering.
 - **L.1b** — Command router + motion-state cleanup (prereq for L.1c).
 
 **Freeze on landing:**