test suite has unrelated failures: custom provider hook + module fixture libsql binary

[onmax]

Context

While working on #107, pnpm test still fails for unrelated/pre-existing reasons.

Reproduction

pnpm test test/custom-provider.test.ts
pnpm test test/module.test.ts

Observed

A) test/custom-provider.test.ts

• Failing assertion:
• expected databaseProvider to be "custom"
• received "none"

B) test/module.test.ts

• Suite fails before running assertions due to environment/binary resolution:
• ENOENT: no such file or directory, realpath '.../node_modules/.pnpm/libsql@0.5.22/node_modules/@libsql/linux-x64-gnu'
• The module suite tests are skipped because fixture bootstrap fails.

Expected

• Custom provider hook test resolves provider as custom.
• Module fixture should run without host-specific libsql binary failures (or skip with an explicit guard).

Scope

This issue is intentionally separate from #107 type inference changes.