1## Why23The current release has only a small built-in teaching campaign and a single selected mod path. Players need a durable way to browse curated content, combine local level packs, and share a level without handing executable code to a recipient.45## What Changes67- Add stable pack and level identifiers and a registry for multiple bundled and loaded packs.8- Ship a curated set of basic level packs and retain all successfully loaded CommonJS modules for the session.9- Export a selected pack as a CommonJS `.cjs` file for explicitly trusted local reuse.10- Encode selected pack data into a portable `#pack=<versioned-payload>` data-only URL, capped at 16 KiB encoded, and validate/decode it without executing JavaScript across site revisions.11- Keep local CommonJS import explicit and trusted, with duplicate and collision diagnostics.12- Add in-app feedback for pack loading, selection, sharing, export, import, and validation failures.13- Expand the built-in playable-puzzles contract from exactly three levels to a curated pack set while preserving the original three MIAU teaching puzzles.1415## Capabilities1617### New Capabilities1819- `level-packs`: Stable pack/level identity, curated bundled packs, multi-pack registry, selection, and collision policy.20- `level-sharing`: Data-only URL sharing, `.cjs` export, explicit trusted local CommonJS import, validation, and user feedback.2122### Modified Capabilities2324- `playable-puzzles`: Replace the exact-three-level limit with a curated set of packs that includes the original three MIAU teaching puzzles.25- `commonjs-mods`: Retain multiple valid modules and define collision behavior when packs or levels overlap.2627## Impact2829Adds pack registry and serialization modules, bundled content metadata, share/export/import controls, validation diagnostics, and browser and engine verification. The design specifies data contracts and feedback states while leaving visual layout and scene ownership to the designer.