Consolidate Test Suites

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

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.

Probes are useful working material, not permanent coverage by default. Before finishing, classify every probe created for the current task as PROMOTE, MERGE, or DROP.

Hard Rules