feat(stablehlo): add MLIR type system and SSA naming#65
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Implement internal/stablehlo/types.go:
- Go-to-MLIR dtype mapping (float32->f32, float16->f16, bfloat16->bf16, etc.)
- SSA value naming with monotonic counter (%v0, %v1, %v2...)
- Tensor type formatting: FormatTensorType([]int{2,3,4}, "f32") -> "tensor<2x3x4xf32>"
- FormatScalarType for bare dtype strings
- StableHLO op name constants for all supported operations
Part of E61.1 (PJRT StableHLO emitter infrastructure).
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Phase 1 PJRT pipeline: MLIR type system foundation.