fix(codegen-kotlin): import cross-package Table objects in MetadataStartupValidator

[dmealing]

What

KotlinValidatorGenerator emitted the generated MetadataStartupValidator registry with bare <Entity>Table references and no imports:

package partylore
private val tablesToValidate = listOf(
    "partylore::arc::ActiveStoryArc" to ActiveStoryArcTable,  // ← unresolved
    ...
)

But each <Entity>Table lives in its entity's own package (partylore.arc.ActiveStoryArcTable, partylore.compliance.ConsentRecordTable, …), while the validator is emitted into a single configured package. Any entity in a different package than the validator → "unresolved reference" compile error. That's every real multi-package project (it surfaced wiring the startup validator over a 16-package domain).

Fix

The validator now imports each Table object whose package differs from the validator's own package — exactly the cross-package import handling KotlinExposedTableGenerator already does for FK targets.

Tests

• New multi-package regression test asserts import acme.blog.AuthorTable / import acme.shop.OrderTable are emitted when entities live in different packages.
• Existing single-package test unchanged (no imports when packages match).

🤖 Generated with Claude Code