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Assign scaffold Target constants for the numerical tier (ticket 5) #174

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@SnowCheetos

Part of #154.

Assigns the scaffold's Target constants for ticket 5 (grilling) via provisional ADR 0004 (docs/adr/0004-first-tier-candidates.md on vulkan/scaffold-7), on a non-final ticket (see the map's floating-point scope).

Candidates compiled in the scaffold (crates/virtio-accel-vulkan/src/lower.rs): FP32 base (VULKAN_TOSA_TARGET, TOSA 1.0 FP Level8K — universal) and provisional INT8 (VULKAN_TOSA_INTEGER_TARGET, TOSA 1.0 Integer — gated per device on shaderInt8 plus VK_KHR_shader_integer_dot_product for MATMUL). FP16 intentionally undeclared until per-device shaderFloat16 + VK_KHR_shader_float_controls probing carries the shared corpus's IDENTITY_EDGES_* (nonfinite, subnormal, signed-zero) per lane; FP8 rejected at admission.

The ticket stays open as design: float-controls variance across ICDs (lavapipe vs RADV vs ANV) and the FP16 gate remain to close before operator work in ticket 9.

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area: backendAccelerator traits, mock backend, and provider conformancehelp wantedExtra attention is neededkind: designSpecification or architectural design workwayfinder:grillingWayfinder decision ticket (HITL)

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