feat(encoding,oracles,time-ordering): expand wire registry and singleton categories

- wire-registry: builtins, encodeBatch, snapshot, unregisterCodec
- decentralized-oracle: listFeeds, feedStats, setQuorum
- temporal-index: queryBucket, bucketsForRange
- Add category README hubs for oracles and time-ordering
- Add _shared/gossip-base.js envelope helpers

Co-authored-by: Cursor <[email protected]>

oracles/hyper-p2p-decentralized-oracle/index.js

@@ -417,6 +417,30 @@ class HyperP2PDecentralizedOracle extends EventEmitter {
     return { ...this.metrics, activeFeeds: this.feeds.size, pendingReports: this.pendingReports.size }
   }
 
+  listFeeds () {
+    return [...this.feeds.keys()]
+  }
+
+  feedStats (feedId) {
+    const feed = this.feeds.get(feedId)
+    if (!feed) return null
+    return {
+      feedId,
+      reports: feed.reports.size,
+      aggregates: feed.aggregates.size,
+      disputes: (feed.disputes && feed.disputes.size) || 0,
+      quorum: feed.quorum
+    }
+  }
+
+  setQuorum (feedId, size) {
+    if (!this.feeds.has(feedId)) {
+      this.feeds.set(feedId, { reports: new Map(), aggregates: new Map(), disputes: new Map(), quorum: size })
+    } else {
+      this.feeds.get(feedId).quorum = size
+    }
+    return size
+  }
 
   getStats () {
     return {