Mirrors retail gmVitalsUI::PostInit: grab Health/Stamina/Mana meters from
the imported layout by their dat element ids (0x100000E6 / EC / EE) and
wire Func<float> fill + Func<string> label providers. Missing ids are
silently skipped (no throw). Slice sprites + dat font already set by the
factory — this is pure data wiring, not graphics.
3 TDD tests: single-meter fill+label, all-three distinct providers, missing-id no-throw.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>