refactor(build): Centralize generated files and clean up project layout

- Task A: Centralized all generated code (assets, timeline) into a single  directory to create a single source of truth.
- Task A: Isolated test asset generation into a temporary build directory, preventing pollution of the main source tree.
- Task B: Vertically compacted all C/C++ source files by removing superfluous newlines.
- Task C: Created a top-level README.md with project overview and file descriptions.
- Task D: Moved non-essential documentation into a  directory to reduce root-level clutter.

1 files changed, 31 insertions, 0 deletions

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+# 64k Demo Project
+
+This is a C++ project aiming to create a cross-platform (Windows, macOS, Linux) 64-kilobyte demo.
+
+## Project Files
+
+- `ASSET_SYSTEM.md`: Describes the custom asset packing and management system.
+- `BUILD.md`: Instructions for building the project.
+- `CONTRIBUTING.md`: Guidelines for contributing, including coding style and commit policies.
+- `FETCH_DEPS.md`: Information on third-party dependencies.
+- `HOWTO.md`: General instructions for running and interacting with the demo.
+- `PROCEDURAL.md`: Details on the procedural texture generation system.
+- `PROJECT_CONTEXT.md`: A comprehensive overview of the project's architecture, features, and current state.
+- `SPEC_EDITOR.md`: Plans for a future web-based spectrogram editor tool.
+- `TODO.md`: A list of immediate, small-scale tasks.
+
+## Source Code Layout
+
+The source code is organized into the following main directories:
+
+- `src/`: The main C++ source code for the demo.
+  - `3d/`: Core 3D rendering components (camera, scene, renderer).
+  - `audio/`: Audio synthesis and processing engine.
+  - `gpu/`: WebGPU rendering pipeline, effects, and shader management.
+  - `procedural/`: Procedural content generation (textures, etc.).
+  - `tests/`: Unit and integration tests for various components.
+  - `util/`: Shared utility classes, like the asset manager.
+- `assets/`: Raw assets (audio, sequence files) that are processed and packed.
+- `scripts/`: Helper scripts for building, packaging, and running the demo.
+- `tools/`: Source code for command-line tools used in the asset pipeline (e.g., `asset_packer`, `spectool`).
+- `third_party/`: Third-party libraries like miniaudio and glfw3webgpu.