Scope acceptance subprocesses and raw SQLite handles

[ian-pascoe]

What to build

Manage acceptance subprocesses and raw SQLite connections as scoped resources so failed assertions, interruption, and timeouts reliably terminate children and close databases without masking the original test failure.

Acceptance criteria

• Every spawned acceptance process has a finalizer that terminates and awaits it when still running.
• Every raw SQLite test connection closes even when an assertion or Effect fails.
• Finalizers do not kill an already completed process or replace the original failure with cleanup noise.
• A focused regression test exercises cleanup on an intentional scoped failure without leaving a child or open database handle.
• The full verification command passes on the supported Bun platform.

Blocked by

None (can start immediately).