Require intercepted support to exist at assessment time #494

🤖 Generated by the Agentic Engineer

Problem

The offline assessor bounds positive runtime support to the proof assessment time, but intercepted support observed later can still support a candidate recommendation.

Proposed direction

Repair the owning observation or output boundary, with a regression that fails on current main before changing the implementation. Preserve the existing conservative behavior and public interface.

Acceptance criteria

• Require successful intercepted support to have existed by the bound assessment time.
• Retain earlier/equal successful support and independently scoped known-failure contraction.
• Exercise the copied assessor and preserve assessment-only authority, unauthenticated evidence and disabled execution/mutation.

Size: S/M. Part of #223.