[codex] Make bundled snippets Next-safe

[meekmachine]

Summary

• replace Vite-only import.meta.glob snippet discovery with an explicit package-owned bundled snippet catalog
• keep the existing snippet preloader API and async loader shape for consumers
• add package-boundary guidance so consumer apps do not grow local runtime shims for Latticework behavior

Root cause

The published package build exposed Vite-only snippet discovery to consumer bundlers. Next/Turbopack cannot execute that runtime artifact, which caused downstream pages to crash during hydration.

Validation

• npm run typecheck
• npm test -- snippetPreloader
• npm run build
• scanned src and dist for import.meta.glob / broken snippet loader artifacts