Restore the pre-c4 classic immediate path for transparent commands without active building detail: always use the shared alpha pipeline and coalesce adjacent same-cull commands across TranslucencyKind boundaries. Keep detail-active material selection, detail arm/reset, and inner cull-run splitting unchanged.
Required mutations and first discriminating failures (all restored):
1. Non-detail arm restored to PipelineForBlend: ClassicImmediate_NonDetailUsesAlphaBlendWhenDetailIsDisabledOrUnavailable first reported InvAlpha/detail-disabled at line 1258; expected wb-mesh-alpha-1x, actual wb-mesh-inverse-1x.
2. Translucency equality split restored with the alpha arm intact: ClassicImmediate_NonDetailCrossBlendRunCoalescesIntoOnePhysicalDraw failed at line 1279; Assert.Single saw 3 physical MDI records.
3. Detail-active command forced onto AlphaBlend: ClassicImmediate_DetailActiveUsesExactMaterialPipelineAndArm failed at line 1303; expected wb-mesh-raw-additive-depth-write-1x, actual wb-mesh-alpha-1x.
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