WIP: Save agent roles integration work before CHORUS rebrand

- Agent roles and coordination features
- Chat API integration testing
- New configuration and workspace management

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

vendor/github.com/libp2p/go-libp2p-pubsub/mcache.go

@@ -0,0 +1,104 @@
+package pubsub
+
+import (
+	"fmt"
+
+	"github.com/libp2p/go-libp2p/core/peer"
+)
+
+// NewMessageCache creates a sliding window cache that remembers messages for as
+// long as `history` slots.
+//
+// When queried for messages to advertise, the cache only returns messages in
+// the last `gossip` slots.
+//
+// The `gossip` parameter must be smaller or equal to `history`, or this
+// function will panic.
+//
+// The slack between `gossip` and `history` accounts for the reaction time
+// between when a message is advertised via IHAVE gossip, and the peer pulls it
+// via an IWANT command.
+func NewMessageCache(gossip, history int) *MessageCache {
+	if gossip > history {
+		err := fmt.Errorf("invalid parameters for message cache; gossip slots (%d) cannot be larger than history slots (%d)",
+			gossip, history)
+		panic(err)
+	}
+	return &MessageCache{
+		msgs:    make(map[string]*Message),
+		peertx:  make(map[string]map[peer.ID]int),
+		history: make([][]CacheEntry, history),
+		gossip:  gossip,
+		msgID: func(msg *Message) string {
+			return DefaultMsgIdFn(msg.Message)
+		},
+	}
+}
+
+type MessageCache struct {
+	msgs    map[string]*Message
+	peertx  map[string]map[peer.ID]int
+	history [][]CacheEntry
+	gossip  int
+	msgID   func(*Message) string
+}
+
+func (mc *MessageCache) SetMsgIdFn(msgID func(*Message) string) {
+	mc.msgID = msgID
+}
+
+type CacheEntry struct {
+	mid   string
+	topic string
+}
+
+func (mc *MessageCache) Put(msg *Message) {
+	mid := mc.msgID(msg)
+	mc.msgs[mid] = msg
+	mc.history[0] = append(mc.history[0], CacheEntry{mid: mid, topic: msg.GetTopic()})
+}
+
+func (mc *MessageCache) Get(mid string) (*Message, bool) {
+	m, ok := mc.msgs[mid]
+	return m, ok
+}
+
+func (mc *MessageCache) GetForPeer(mid string, p peer.ID) (*Message, int, bool) {
+	m, ok := mc.msgs[mid]
+	if !ok {
+		return nil, 0, false
+	}
+
+	tx, ok := mc.peertx[mid]
+	if !ok {
+		tx = make(map[peer.ID]int)
+		mc.peertx[mid] = tx
+	}
+	tx[p]++
+
+	return m, tx[p], true
+}
+
+func (mc *MessageCache) GetGossipIDs(topic string) []string {
+	var mids []string
+	for _, entries := range mc.history[:mc.gossip] {
+		for _, entry := range entries {
+			if entry.topic == topic {
+				mids = append(mids, entry.mid)
+			}
+		}
+	}
+	return mids
+}
+
+func (mc *MessageCache) Shift() {
+	last := mc.history[len(mc.history)-1]
+	for _, entry := range last {
+		delete(mc.msgs, entry.mid)
+		delete(mc.peertx, entry.mid)
+	}
+	for i := len(mc.history) - 2; i >= 0; i-- {
+		mc.history[i+1] = mc.history[i]
+	}
+	mc.history[0] = nil
+}