initSchema() previously read schema.sql from disk at runtime via readFileSync,
which broke in compiled Bun binaries and Deno Edge Functions. Now uses a
generated schema-embedded.ts constant (run `bun run build:schema` to regenerate).
- Removes fs and path imports from postgres-engine.ts and db.ts
- Adds scripts/build-schema.sh for one-source-of-truth generation
- Adds build:schema npm script
Fixes Issue #22 Bug #6.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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