Make bundled snippets safe for non-Vite consumers

[meekmachine]

Summary

• Replace top-level import.meta.glob snippet discovery with an explicit package-owned bundled snippet catalog.
• Keep the existing async preloader API while avoiding Vite-only module evaluation in package consumers such as Next/Turbopack.
• Add runtime-boundary guidance to prevent consumer-local shims for package compatibility failures.

Verification

• npm run typecheck
• npm test -- snippetPreloader
• npm exec tsup and confirmed dist/src contain no import.meta.glob or generated undefined("./snippets...") calls.

Notes

• Full npm run build could not complete on my machine because local Java is 11 and the CLJS worker build currently needs Java 21.