Why: U3 needs bounded, source-indexed premises before the host can judge numeric and membership claims.
Evidence: TestWorkCheckpointEvidenceModesAndBounds failed on missing types, then go test ./... -count=1 and git diff --check passed.
Impact: Extend only the candidate wire contract; persisted task snapshots and display kinds stay unchanged.
Refs: Dev task feature/fast-slow-u2-u3-plan; r0.3 evidence implementation plan Task 1
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