feat: initialize cargo workspace with voltex_math, voltex_platform, voltex_renderer

Phase 1 Task 1 - workspace scaffolding with stub crates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/voltex_math/Cargo.toml

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+[package]
+name = "voltex_math"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+
+[dev-dependencies]

crates/voltex_math/src/lib.rs

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+// Voltex Math Library - Phase 1

crates/voltex_platform/Cargo.toml

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+[package]
+name = "voltex_platform"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+voltex_math.workspace = true
+winit.workspace = true
+log.workspace = true

crates/voltex_platform/src/lib.rs

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+// Voltex Platform - Phase 1
+// Modules will be added in Task 3

crates/voltex_renderer/Cargo.toml

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+[package]
+name = "voltex_renderer"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+voltex_math.workspace = true
+voltex_platform.workspace = true
+wgpu.workspace = true
+winit.workspace = true
+bytemuck.workspace = true
+pollster.workspace = true
+log.workspace = true

crates/voltex_renderer/src/lib.rs

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+// Voltex Renderer - Phase 1
+// Modules will be added in Task 4