feat(transform): add bundle transpile/apply drivers

[pyramation]

Summary

Follow-up to #316: brings bundle-driver.ts into @pgsql/transform after all. It was originally excluded on the assumption it depended on @pgpmjs/bundle — it doesn't: the pgpm bundle seams (transpileBundle's renameChange/transformScript, applyBundle's validateReferences) are structurally typed in the driver, so makeSchemaTranspiler / makeNamespaceValidator are pure function factories over transformSql + classifyStatements with zero new dependencies.

• Adds src/bundle-driver.ts (verbatim from transform-schemas) + its unit test (bundle-driver.test.ts, 9 tests) and re-exports (BundleScriptContext, SchemaTranspilerOptions, SchemaTranspiler, NamespaceValidatorOptions, makeSchemaTranspiler, makeNamespaceValidator).
• The pgpm-coupled e2e test (which really does import @pgpmjs/bundle) stays downstream in constructive-db.

With this, @pgsql/transform covers 100% of transform-schemas' src/, so constructive-db can delete the package outright (no relocation needed). Build + 183 tests pass.

Link to Devin session: https://app.devin.ai/sessions/1aa52746e60c4df38ef2678d168269b9
Requested by: @pyramation

[devin-ai-integration]

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