feat(rendering): Vendor Bevy rendering crates (Phase 1 complete)

Closes #6, #7, #8, #9, #10
Refs #2, #122

Vendored bevy_render, bevy_core_pipeline, and bevy_pbr from Bevy v0.17.2
(commit 566358363126dd69f6e457e47f306c68f8041d2a) into libmarathon.

- ~51K LOC vendored to crates/libmarathon/src/render/
- Merged bevy_render_macros into crates/macros/
- Fixed 773→0 compilation errors
- Updated dependencies (encase 0.10→0.11, added 4 new deps)
- Removed bevy_render/pbr/core_pipeline from app Cargo features

All builds passing, macOS smoke test successful.

Signed-off-by: Sienna Meridian Satterwhite <sienna@r3t.io>

crates/libmarathon/src/render/bindless.wgsl

@@ -0,0 +1,37 @@
+// Defines the common arrays used to access bindless resources.
+//
+// This need to be kept up to date with the `BINDING_NUMBERS` table in
+// `bindless.rs`.
+//
+// You access these by indexing into the bindless index table, and from there
+// indexing into the appropriate binding array. For example, to access the base
+// color texture of a `StandardMaterial` in bindless mode, write
+// `bindless_textures_2d[materials[slot].base_color_texture]`, where
+// `materials` is the bindless index table and `slot` is the index into that
+// table (which can be found in the `Mesh`).
+
+#define_import_path bevy_render::bindless
+
+#ifdef BINDLESS
+
+// Binding 0 is the bindless index table.
+// Filtering samplers.
+@group(#{MATERIAL_BIND_GROUP}) @binding(1) var bindless_samplers_filtering: binding_array<sampler>;
+// Non-filtering samplers (nearest neighbor).
+@group(#{MATERIAL_BIND_GROUP}) @binding(2) var bindless_samplers_non_filtering: binding_array<sampler>;
+// Comparison samplers (typically for shadow mapping).
+@group(#{MATERIAL_BIND_GROUP}) @binding(3) var bindless_samplers_comparison: binding_array<sampler>;
+// 1D textures.
+@group(#{MATERIAL_BIND_GROUP}) @binding(4) var bindless_textures_1d: binding_array<texture_1d<f32>>;
+// 2D textures.
+@group(#{MATERIAL_BIND_GROUP}) @binding(5) var bindless_textures_2d: binding_array<texture_2d<f32>>;
+// 2D array textures.
+@group(#{MATERIAL_BIND_GROUP}) @binding(6) var bindless_textures_2d_array: binding_array<texture_2d_array<f32>>;
+// 3D textures.
+@group(#{MATERIAL_BIND_GROUP}) @binding(7) var bindless_textures_3d: binding_array<texture_3d<f32>>;
+// Cubemap textures.
+@group(#{MATERIAL_BIND_GROUP}) @binding(8) var bindless_textures_cube: binding_array<texture_cube<f32>>;
+// Cubemap array textures.
+@group(#{MATERIAL_BIND_GROUP}) @binding(9) var bindless_textures_cube_array: binding_array<texture_cube_array<f32>>;
+
+#endif  // BINDLESS