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, 13 insertions, 0 deletions

diff --git a/src/generated/assets.h b/src/generated/assets.h
new file mode 100644
index 0000000..3e89aaa
--- /dev/null
+++ b/src/generated/assets.h
@@ -0,0 +1,13 @@
+// This file is auto-generated by asset_packer.cc. Do not edit.
+
+#pragma once
+#include <cstdint>
+
+enum class AssetId : uint16_t {
+  ASSET_KICK_1 = 0,
+  ASSET_SNARE_1 = 1,
+  ASSET_HIHAT_1 = 2,
+  ASSET_NOISE_TEX = 3,
+  ASSET_LAST_ID = 4,
+};
+#include "util/asset_manager.h"