Refuse malformed synthetic evidence declarations #484

🤖 Generated by the Agentic Engineer

Problem

An explicit null synthetic declaration is silently decoded as false, producing misleading provenance in an offline autonomy result.

Proposal

Require a declared synthetic value to be a real boolean rather than treating malformed data as observed evidence.

Acceptance criteria

Null and other nonboolean declarations refuse without an assessment; true and false retain their classifications, and no execution authority is introduced.

Reproduced offline against freshly fetched main using synthetic fixtures. No inspected source was executed and no provider experiment was launched. Size: S.

Part of #223.