ExperimentalExperimentalApply one RealtimeReconciliationResult: "rebuild" replaces the
cache wholesale (creates only — the caller's rebuild path already
re-materializes from the authoritative store); "patch" applies each
change in place. Throws HonuaRealtimeReconciliationError
("disposed") once disposed.
Experimental
A renderer-neutral, identity-keyed feature cache kept in sync by reconciliation results.