Q-Chain quantum finality verification is now integrated directly into
the Oracle instead of being a CLI flag toggle. This provides:
- oracle.SetVerifier(v) to attach Q-Chain verifier
- oracle.VerifiedPrice(sym) returns price with finality status
- Verifier is auto-started and auto-stopped with Oracle
- No flag needed - verification is automatic when verifier attached
- Use -no-verify flag to explicitly disable (opt-out vs opt-in)
The VerifiedData type wraps price Data with finality proof, making
quantum finality a first-class concern of the price aggregation system.