Consolidate Test Suites

Purpose: place each invariant in one owning test layer only.

This skill owns test placement and probe cleanup. It does not require new coverage: reusing an existing check without editing tests is a valid outcome. Reuse any test-admission decision already made in the task; do not add another admission review or repeat completed verification.

Definitions:

• Invariant: the rule that must stay true.
• Owning layer: the lowest layer that truly owns and can prove that rule.
• Canonical suite: the normal existing suite for that owning layer.
• Probe: temporary test code, fixture, script, snapshot, diagnostic, assertion, instrumentation, or helper created to investigate or reproduce one task.

Default: reuse an existing canonical suite. Do not create a new standalone regression test unless the exception rule below allows it.