fix: keep rune and repeat bundles conductor-safe

[11suixing11]

Summary

• replace rune/repeat Conductor bundle imports from modules-lib errors/utilities with Conductor errors/assertions or local pure helpers
• keep repeat_internal synchronous without callWithoutMetadata so rune can import repeat without pulling js-slang externals
• add local hexToColor/hueToRgb helpers used by rune color functions

Fixes #825

Testing

• yarn workspace @sourceacademy/bundle-rune test
• yarn workspace @sourceacademy/bundle-repeat test
• yarn workspace @sourceacademy/bundle-rune tsc
• yarn workspace @sourceacademy/bundle-repeat tsc
• yarn workspace @sourceacademy/bundle-rune lint
• yarn workspace @sourceacademy/bundle-repeat lint (passes with existing IModuleExport warning)
• yarn workspace @sourceacademy/bundle-repeat build
• yarn workspace @sourceacademy/bundle-rune build
• rg "js-slang|@sourceacademy/modules-lib/(errors|utilities)|assertNumberWithinRange|callWithoutMetadata|InvalidParameterTypeError|GeneralRuntimeError" build/bundles/rune.js build/bundles/repeat.js -n (no matches)

[gemini-code-assist]

Caution

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