Quorum and canonicalization

Marking canonical updates are produced under a deterministic source policy.

The feed manifest declares:

• eligible sources;
• minimum source boundary;
• aggregation policy;
• quote/unit;
• delivery modes.

Canonicalization can reject observations when they are stale, outside the accepted source set, fail quote conversion policy, or diverge beyond configured tolerance.

Consumers receive:

• contributingSources;
• excludedSources;
• confidence.sourceCount;
• confidence.eligibleSourceCount;
• confidence.agreementBps;
• timestamp fields for source, receive, normalize, canonicalize, and sign stages.

This gives bots and protocols enough metadata to apply their own acceptance policy before acting.