docs: Refactor code structure for improved readability

MODULE.bazel

@@ -3,11 +3,13 @@ module(
     version = "0.2.0",
 )
 
+# Core ruleset dependencies.
 bazel_dep(name = "platforms", version = "1.0.0")
 bazel_dep(name = "rules_shell", version = "0.6.1")
 bazel_dep(name = "bazel_skylib", version = "1.8.2")
 bazel_dep(name = "stardoc", version = "0.7.2")
 
+# Repository-local setup for this ruleset's own tests and examples.
 bun_ext = use_extension("//bun:extensions.bzl", "bun")
 use_repo(
     bun_ext,
@@ -18,6 +20,7 @@ use_repo(
     "bun_windows_x64",
 )
 
+# Test fixture dependency installation used by //tests/script_test.
 bun_install_ext = use_extension("//bun:extensions.bzl", "bun_install")
 bun_install_ext.install(
     name = "script_test_vite_node_modules",
@@ -26,6 +29,7 @@ bun_install_ext.install(
 )
 use_repo(bun_install_ext, "script_test_vite_node_modules")
 
+# Register the published Bun toolchains for this repository.
 register_toolchains(
     "//bun:darwin_aarch64_toolchain",
     "//bun:darwin_x64_toolchain",