chore(runtime): migrate to rslib bundleless

[ScriptedAlchemy]

Per-package rslib bundleless migration for runtime.

[changeset-bot]

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Latest commit: 98317e7

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[chatgpt-codex-connector]

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Reviewed commit: 98317e719d

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[chatgpt-codex-connector]

Use .mjs for ESM entrypoints

Rslib’s ESM output defaults to .mjs in this repo (see the existing rslib-built package packages/modernjs which exports dist/esm/*.mjs), but the runtime package now points all ESM entrypoints to .js (e.g., ./dist/index.js). If rslib keeps emitting .mjs here as well, ESM consumers will hit MODULE_NOT_FOUND at runtime because the files referenced in module/exports.import don’t exist. Consider switching these ESM paths to .mjs (or explicitly configuring rslib to emit .js).

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