Consume exact UCNS 157×7×7×53 candidate state

[erinepshovel-code]

Summary:

• pin UCNS merged producer b7b6f35cce69c273860923489a1c8b5372d14eb0 exactly
• validate its bundled candidate receipt through the producer API and independently verify materialized state bytes
• activate UCNS provenance only for the exact 157×7×7×53 default target state
• retain explicit, separately attributed fallback and typed suspension for unmatched shapes

Validation:

• 168 pytest tests passed
• contract audit closed
• ratios: 228 verified, zero drift/gaps
• sdist and wheel built; twine checks passed
• force-installed wheel smoke produced target backend with active receipt

Boundaries: construction compatibility only. Continuous seven-fold geometry, representative efficacy, and production privacy remain unresolved.