Begin refactoring of rendering engine

[vmarcella]

When transitioning the engine to use wgpu as opposed to gfx-hal, a lot of shortcuts were taken to get the examples and API working with as minimal changes as possible. This starts refactoring some of the direct wgpu usage out of lambda-rs and implements wrappers over wgpu inside of lambda-rs-platform.

[Copilot]

Pull Request Overview

This pull request introduces a platform abstraction layer for wgpu command encoding and buffer operations. The changes move low-level wgpu details into a new platform module while providing higher-level wrappers for the renderer.

• Introduces CommandEncoder and RenderPass wrapper types in the platform layer
• Adds a new buffer module in the platform layer with Buffer and BufferBuilder
• Refactors the renderer to use these new abstractions instead of raw wgpu types

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 18 comments.

File	Description
crates/lambda-rs/src/render/mod.rs	Updates imports and refactors command encoder/render pass creation to use new platform wrappers
crates/lambda-rs/src/render/buffer.rs	Refactors to delegate buffer creation to platform layer, adds helper methods and tests
crates/lambda-rs-platform/src/wgpu/mod.rs	Adds CommandEncoder and RenderPass wrapper types with convenience methods
crates/lambda-rs-platform/src/wgpu/buffer.rs	New file implementing platform-level buffer wrapper with builder pattern

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