fix(session): restore thread and legacy compatibility

pkg/agent/loop.go

@@ -805,6 +805,8 @@ func outboundTurnMetadata(
 func outboundMessageForTurn(ts *turnState, content string) bus.OutboundMessage {
 	agentID, sessionKey, scope := outboundTurnMetadata(ts.agent.ID, ts.sessionKey, ts.opts.Dispatch.SessionScope)
 	return bus.OutboundMessage{
+		Channel: ts.channel,
+		ChatID:  ts.chatID,
 		Context: outboundContextFromInbound(
 			ts.opts.Dispatch.InboundContext,
 			ts.channel,
@@ -2827,6 +2829,8 @@ turnLoop:
 					parts = append(parts, part)
 				}
 				outboundMedia := bus.OutboundMediaMessage{
+					Channel: ts.channel,
+					ChatID:  ts.chatID,
 					Context: outboundContextFromInbound(
 						ts.opts.Dispatch.InboundContext,
 						ts.channel,

pkg/agent/steering.go

@@ -3,6 +3,7 @@ package agent
 import (
 	"context"
 	"fmt"
+	"sort"
 	"strings"
 	"sync"
 
@@ -319,7 +320,9 @@ func (al *AgentLoop) agentForSession(sessionKey string) *AgentInstance {
 		return nil
 	}
 
-	for _, agentID := range registry.ListAgentIDs() {
+	agentIDs := registry.ListAgentIDs()
+	sort.Strings(agentIDs)
+	for _, agentID := range agentIDs {
 		agent, ok := registry.GetAgent(agentID)
 		if !ok || agent == nil {
 			continue
@@ -331,7 +334,6 @@ func (al *AgentLoop) agentForSession(sessionKey string) *AgentInstance {
 		if scopedAgent, ok := registry.GetAgent(resolvedAgentID); ok {
 			return scopedAgent
 		}
-		return agent
 	}
 
 	return registry.GetDefaultAgent()

pkg/bus/bus.go

@@ -90,10 +90,10 @@ func publish[T any](ctx context.Context, mb *MessageBus, ch chan T, msg T) error
 }
 
 func (mb *MessageBus) PublishInbound(ctx context.Context, msg InboundMessage) error {
+	msg = NormalizeInboundMessage(msg)
 	if msg.Context.isZero() {
 		return ErrMissingInboundContext
 	}
-	msg = NormalizeInboundMessage(msg)
 	return publish(ctx, mb, mb.inbound, msg)
 }
 
@@ -102,10 +102,10 @@ func (mb *MessageBus) InboundChan() <-chan InboundMessage {
 }
 
 func (mb *MessageBus) PublishOutbound(ctx context.Context, msg OutboundMessage) error {
+	msg = NormalizeOutboundMessage(msg)
 	if msg.Context.isZero() {
 		return ErrMissingOutboundContext
 	}
-	msg = NormalizeOutboundMessage(msg)
 	return publish(ctx, mb, mb.outbound, msg)
 }
 
@@ -114,10 +114,10 @@ func (mb *MessageBus) OutboundChan() <-chan OutboundMessage {
 }
 
 func (mb *MessageBus) PublishOutboundMedia(ctx context.Context, msg OutboundMediaMessage) error {
+	msg = NormalizeOutboundMediaMessage(msg)
 	if msg.Context.isZero() {
 		return ErrMissingOutboundMediaContext
 	}
-	msg = NormalizeOutboundMediaMessage(msg)
 	return publish(ctx, mb, mb.outboundMedia, msg)
 }
 

pkg/bus/inbound_context.go

@@ -65,10 +65,5 @@ func cloneStringMap(src map[string]string) map[string]string {
 }
 
 func normalizeKind(kind string) string {
-	switch strings.ToLower(strings.TrimSpace(kind)) {
-	case "direct", "group", "channel", "guild", "team", "workspace", "tenant", "topic":
-		return strings.ToLower(strings.TrimSpace(kind))
-	default:
-		return strings.ToLower(strings.TrimSpace(kind))
-	}
+	return strings.ToLower(strings.TrimSpace(kind))
 }

pkg/bus/outbound_context.go

@@ -15,23 +15,48 @@ func NewOutboundContext(channel, chatID, replyToMessageID string) InboundContext
 // NormalizeOutboundMessage ensures Context is normalized and keeps convenience
 // mirrors in sync for runtime consumers.
 func NormalizeOutboundMessage(msg OutboundMessage) OutboundMessage {
-	msg.Context = normalizeInboundContext(msg.Context)
-	msg.Channel = msg.Context.Channel
-	msg.ChatID = msg.Context.ChatID
-	msg.Scope = cloneOutboundScope(msg.Scope)
+	msg.Channel = strings.TrimSpace(msg.Channel)
+	msg.ChatID = strings.TrimSpace(msg.ChatID)
+	msg.ReplyToMessageID = strings.TrimSpace(msg.ReplyToMessageID)
+	if msg.Context.Channel == "" {
+		msg.Context.Channel = msg.Channel
+	}
+	if msg.Context.ChatID == "" {
+		msg.Context.ChatID = msg.ChatID
+	}
 	if msg.Context.ReplyToMessageID == "" {
-		msg.Context.ReplyToMessageID = strings.TrimSpace(msg.ReplyToMessageID)
+		msg.Context.ReplyToMessageID = msg.ReplyToMessageID
+	}
+	msg.Context = normalizeInboundContext(msg.Context)
+	if msg.Channel == "" {
+		msg.Channel = msg.Context.Channel
+	}
+	if msg.ChatID == "" {
+		msg.ChatID = msg.Context.ChatID
 	}
 	msg.ReplyToMessageID = msg.Context.ReplyToMessageID
+	msg.Scope = cloneOutboundScope(msg.Scope)
 	return msg
 }
 
 // NormalizeOutboundMediaMessage ensures media outbound messages also carry a
 // normalized context while keeping convenience mirrors in sync.
 func NormalizeOutboundMediaMessage(msg OutboundMediaMessage) OutboundMediaMessage {
+	msg.Channel = strings.TrimSpace(msg.Channel)
+	msg.ChatID = strings.TrimSpace(msg.ChatID)
+	if msg.Context.Channel == "" {
+		msg.Context.Channel = msg.Channel
+	}
+	if msg.Context.ChatID == "" {
+		msg.Context.ChatID = msg.ChatID
+	}
 	msg.Context = normalizeInboundContext(msg.Context)
-	msg.Channel = msg.Context.Channel
-	msg.ChatID = msg.Context.ChatID
+	if msg.Channel == "" {
+		msg.Channel = msg.Context.Channel
+	}
+	if msg.ChatID == "" {
+		msg.ChatID = msg.Context.ChatID
+	}
 	msg.Scope = cloneOutboundScope(msg.Scope)
 	return msg
 }

pkg/channels/manager.go

@@ -103,7 +103,7 @@ func outboundMessageChannel(msg bus.OutboundMessage) string {
 }
 
 func outboundMessageChatID(msg bus.OutboundMessage) string {
-	return msg.Context.ChatID
+	return msg.ChatID
 }
 
 func outboundMediaChannel(msg bus.OutboundMediaMessage) string {
@@ -111,7 +111,7 @@ func outboundMediaChannel(msg bus.OutboundMediaMessage) string {
 }
 
 func outboundMediaChatID(msg bus.OutboundMediaMessage) string {
-	return msg.Context.ChatID
+	return msg.ChatID
 }
 
 // RecordPlaceholder registers a placeholder message for later editing.

pkg/channels/slack/slack.go

@@ -113,7 +113,7 @@ func (c *SlackChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]str
 		return nil, channels.ErrNotRunning
 	}
 
-	channelID, threadTS := parseSlackChatID(msg.ChatID)
+	deliveryChatID, channelID, threadTS := resolveSlackOutboundTarget(msg.ChatID, &msg.Context)
 	if channelID == "" {
 		return nil, fmt.Errorf("invalid slack chat ID: %s", msg.ChatID)
 	}
@@ -135,7 +135,7 @@ func (c *SlackChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]str
 		return nil, fmt.Errorf("slack send: %w", channels.ErrTemporary)
 	}
 
-	if ref, ok := c.pendingAcks.LoadAndDelete(msg.ChatID); ok {
+	if ref, ok := c.pendingAcks.LoadAndDelete(deliveryChatID); ok {
 		msgRef := ref.(slackMessageRef)
 		c.api.AddReaction("white_check_mark", slack.ItemRef{
 			Channel:   msgRef.ChannelID,
@@ -157,7 +157,7 @@ func (c *SlackChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessa
 		return nil, channels.ErrNotRunning
 	}
 
-	channelID, _ := parseSlackChatID(msg.ChatID)
+	_, channelID, threadTS := resolveSlackMediaOutboundTarget(msg.ChatID, &msg.Context)
 	if channelID == "" {
 		return nil, fmt.Errorf("invalid slack chat ID: %s", msg.ChatID)
 	}
@@ -188,10 +188,11 @@ func (c *SlackChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessa
 		}
 
 		_, err = c.api.UploadFileV2Context(ctx, slack.UploadFileV2Parameters{
-			Channel:  channelID,
-			File:     localPath,
-			Filename: filename,
-			Title:    title,
+			Channel:         channelID,
+			ThreadTimestamp: threadTS,
+			File:            localPath,
+			Filename:        filename,
+			Title:           title,
 		})
 		if err != nil {
 			logger.ErrorCF("slack", "Failed to upload media", map[string]any{
@@ -561,3 +562,33 @@ func parseSlackChatID(chatID string) (channelID, threadTS string) {
 	}
 	return channelID, threadTS
 }
+
+func resolveSlackOutboundTarget(chatID string, outboundCtx *bus.InboundContext) (string, string, string) {
+	deliveryChatID := strings.TrimSpace(chatID)
+	if deliveryChatID == "" && outboundCtx != nil {
+		deliveryChatID = strings.TrimSpace(outboundCtx.ChatID)
+	}
+	channelID, threadTS := parseSlackChatID(deliveryChatID)
+	if threadTS == "" && outboundCtx != nil {
+		threadTS = strings.TrimSpace(outboundCtx.TopicID)
+		if threadTS != "" && channelID != "" {
+			deliveryChatID = channelID + "/" + threadTS
+		}
+	}
+	return deliveryChatID, channelID, threadTS
+}
+
+func resolveSlackMediaOutboundTarget(chatID string, outboundCtx *bus.InboundContext) (string, string, string) {
+	deliveryChatID := strings.TrimSpace(chatID)
+	if deliveryChatID == "" && outboundCtx != nil {
+		deliveryChatID = strings.TrimSpace(outboundCtx.ChatID)
+	}
+	channelID, threadTS := parseSlackChatID(deliveryChatID)
+	if threadTS == "" && outboundCtx != nil {
+		threadTS = strings.TrimSpace(outboundCtx.TopicID)
+		if threadTS != "" && channelID != "" {
+			deliveryChatID = channelID + "/" + threadTS
+		}
+	}
+	return deliveryChatID, channelID, threadTS
+}

pkg/channels/slack/slack_test.go

@@ -53,6 +53,24 @@ func TestParseSlackChatID(t *testing.T) {
 	}
 }
 
+func TestResolveSlackOutboundTarget_PrefersContextTopicID(t *testing.T) {
+	deliveryChatID, channelID, threadTS := resolveSlackOutboundTarget("C123456", &bus.InboundContext{
+		Channel: "slack",
+		ChatID:  "C123456",
+		TopicID: "1234567890.123456",
+	})
+
+	if deliveryChatID != "C123456/1234567890.123456" {
+		t.Fatalf("deliveryChatID = %q, want %q", deliveryChatID, "C123456/1234567890.123456")
+	}
+	if channelID != "C123456" {
+		t.Fatalf("channelID = %q, want %q", channelID, "C123456")
+	}
+	if threadTS != "1234567890.123456" {
+		t.Fatalf("threadTS = %q, want %q", threadTS, "1234567890.123456")
+	}
+}
+
 func TestStripBotMention(t *testing.T) {
 	ch := &SlackChannel{botUserID: "U12345BOT"}
 

pkg/channels/telegram/telegram.go

@@ -176,7 +176,7 @@ func (c *TelegramChannel) Send(ctx context.Context, msg bus.OutboundMessage) ([]
 
 	useMarkdownV2 := c.config.Channels.Telegram.UseMarkdownV2
 
-	chatID, threadID, err := parseTelegramChatID(msg.ChatID)
+	chatID, threadID, err := resolveTelegramOutboundTarget(msg.ChatID, &msg.Context)
 	if err != nil {
 		return nil, fmt.Errorf("invalid chat ID %s: %w", msg.ChatID, channels.ErrSendFailed)
 	}
@@ -463,7 +463,7 @@ func (c *TelegramChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMe
 		return nil, channels.ErrNotRunning
 	}
 
-	chatID, threadID, err := parseTelegramChatID(msg.ChatID)
+	chatID, threadID, err := resolveTelegramOutboundTarget(msg.ChatID, &msg.Context)
 	if err != nil {
 		return nil, fmt.Errorf("invalid chat ID %s: %w", msg.ChatID, channels.ErrSendFailed)
 	}
@@ -960,6 +960,28 @@ func parseTelegramChatID(chatID string) (int64, int, error) {
 	return cid, tid, nil
 }
 
+func resolveTelegramOutboundTarget(chatID string, outboundCtx *bus.InboundContext) (int64, int, error) {
+	targetChatID := strings.TrimSpace(chatID)
+	if targetChatID == "" && outboundCtx != nil {
+		targetChatID = strings.TrimSpace(outboundCtx.ChatID)
+	}
+	resolvedChatID, resolvedThreadID, err := parseTelegramChatID(targetChatID)
+	if err != nil {
+		return 0, 0, err
+	}
+	if resolvedThreadID != 0 || outboundCtx == nil {
+		return resolvedChatID, resolvedThreadID, nil
+	}
+	topicID := strings.TrimSpace(outboundCtx.TopicID)
+	if topicID == "" {
+		return resolvedChatID, resolvedThreadID, nil
+	}
+	if threadID, convErr := strconv.Atoi(topicID); convErr == nil {
+		return resolvedChatID, threadID, nil
+	}
+	return resolvedChatID, resolvedThreadID, nil
+}
+
 func logParseFailed(err error, useMarkdownV2 bool) {
 	parsingName := "HTML"
 	if useMarkdownV2 {

pkg/channels/telegram/telegram_test.go

@@ -527,6 +527,38 @@ func TestSend_WithForumThreadID(t *testing.T) {
 	assert.Len(t, caller.calls, 1)
 }
 
+func TestSend_UsesContextTopicIDWhenChatIDDoesNotIncludeThread(t *testing.T) {
+	caller := &stubCaller{
+		callFn: func(ctx context.Context, url string, data *ta.RequestData) (*ta.Response, error) {
+			return successResponse(t), nil
+		},
+	}
+	ch := newTestChannel(t, caller)
+
+	_, err := ch.Send(context.Background(), bus.OutboundMessage{
+		ChatID:  "-1001234567890",
+		Content: "Hello from topic context",
+		Context: bus.InboundContext{
+			Channel: "telegram",
+			ChatID:  "-1001234567890",
+			TopicID: "42",
+		},
+	})
+
+	require.NoError(t, err)
+	require.Len(t, caller.calls, 1)
+
+	var params struct {
+		ChatID          int64  `json:"chat_id"`
+		MessageThreadID int    `json:"message_thread_id"`
+		Text            string `json:"text"`
+	}
+	require.NoError(t, json.Unmarshal(caller.calls[0].Data.BodyRaw, &params))
+	assert.Equal(t, int64(-1001234567890), params.ChatID)
+	assert.Equal(t, 42, params.MessageThreadID)
+	assert.Equal(t, "Hello from topic context", params.Text)
+}
+
 func TestHandleMessage_ForumTopic_SetsMetadata(t *testing.T) {
 	messageBus := bus.NewMessageBus()
 	ch := &TelegramChannel{

pkg/config/config_test.go

@@ -425,6 +425,52 @@ func TestLoadConfig_PrefersDispatchRulesOverLegacyBindings(t *testing.T) {
 	}
 }
 
+func TestLoadConfig_MigratesLegacyDirectBindingsWithIdentityLinks(t *testing.T) {
+	dir := t.TempDir()
+	configPath := filepath.Join(dir, "config.json")
+	raw := `{
+		"version": 2,
+		"agents": {
+			"defaults": {
+				"workspace": "~/.picoclaw/workspace",
+				"model": "glm-4.7"
+			},
+			"list": [
+				{ "id": "main", "default": true },
+				{ "id": "support" }
+			]
+		},
+		"session": {
+			"identity_links": {
+				"john": ["telegram:123", "123"]
+			}
+		},
+		"bindings": [
+			{
+				"agent_id": "support",
+				"match": {
+					"channel": "telegram",
+					"peer": { "kind": "direct", "id": "123" }
+				}
+			}
+		]
+	}`
+	if err := os.WriteFile(configPath, []byte(raw), 0o644); err != nil {
+		t.Fatalf("WriteFile(configPath): %v", err)
+	}
+
+	cfg, err := LoadConfig(configPath)
+	if err != nil {
+		t.Fatalf("LoadConfig() error: %v", err)
+	}
+	if cfg.Agents.Dispatch == nil || len(cfg.Agents.Dispatch.Rules) != 1 {
+		t.Fatalf("Dispatch.Rules = %+v, want 1 migrated rule", cfg.Agents.Dispatch)
+	}
+	if got := cfg.Agents.Dispatch.Rules[0].When.Sender; got != "john" {
+		t.Fatalf("migrated sender selector = %q, want %q", got, "john")
+	}
+}
+
 // TestDefaultConfig_HeartbeatEnabled verifies heartbeat is enabled by default
 func TestDefaultConfig_HeartbeatEnabled(t *testing.T) {
 	cfg := DefaultConfig()

pkg/config/legacy_bindings.go

@@ -57,7 +57,7 @@ func applyLegacyBindingsMigration(data []byte, cfg *Config) {
 		return
 	}
 
-	rules, dropped := migrateLegacyBindings(bindings)
+	rules, dropped := migrateLegacyBindings(bindings, cfg.Session.IdentityLinks)
 	if len(rules) == 0 {
 		logger.WarnF(
 			"legacy bindings config is deprecated and could not be migrated",
@@ -97,7 +97,7 @@ func decodeLegacyBindings(data []byte) ([]legacyAgentBinding, bool, error) {
 	return bindings, true, nil
 }
 
-func migrateLegacyBindings(bindings []legacyAgentBinding) ([]DispatchRule, int) {
+func migrateLegacyBindings(bindings []legacyAgentBinding, identityLinks map[string][]string) ([]DispatchRule, int) {
 	if len(bindings) == 0 {
 		return nil, 0
 	}
@@ -111,7 +111,7 @@ func migrateLegacyBindings(bindings []legacyAgentBinding) ([]DispatchRule, int)
 	prioritized := make([]prioritizedRule, 0, len(bindings))
 	dropped := 0
 	for i, binding := range bindings {
-		rule, kind, ok := migrateLegacyBinding(binding, i)
+		rule, kind, ok := migrateLegacyBinding(binding, i, identityLinks)
 		if !ok {
 			dropped++
 			continue
@@ -133,7 +133,11 @@ func migrateLegacyBindings(bindings []legacyAgentBinding) ([]DispatchRule, int)
 	return rules, dropped
 }
 
-func migrateLegacyBinding(binding legacyAgentBinding, index int) (DispatchRule, int, bool) {
+func migrateLegacyBinding(
+	binding legacyAgentBinding,
+	index int,
+	identityLinks map[string][]string,
+) (DispatchRule, int, bool) {
 	channel := strings.ToLower(strings.TrimSpace(binding.Match.Channel))
 	agentID := strings.TrimSpace(binding.AgentID)
 	if channel == "" || agentID == "" {
@@ -163,7 +167,7 @@ func migrateLegacyBinding(binding legacyAgentBinding, index int) (DispatchRule,
 		}
 		switch peerKind {
 		case "direct":
-			rule.When.Sender = peerID
+			rule.When.Sender = canonicalLegacyBindingSenderID(channel, peerID, identityLinks)
 			return rule, 0, true
 		case "group", "channel":
 			rule.When.Chat = peerKind + ":" + peerID
@@ -207,3 +211,57 @@ func normalizeLegacyAccountSelector(accountID string) string {
 		return strings.ToLower(accountID)
 	}
 }
+
+func canonicalLegacyBindingSenderID(channel, peerID string, identityLinks map[string][]string) string {
+	peerID = strings.TrimSpace(peerID)
+	if peerID == "" {
+		return ""
+	}
+
+	if linked := resolveLegacyBindingLinkedID(identityLinks, channel, peerID); linked != "" {
+		return strings.ToLower(linked)
+	}
+
+	return strings.ToLower(peerID)
+}
+
+func resolveLegacyBindingLinkedID(identityLinks map[string][]string, channel, peerID string) string {
+	if len(identityLinks) == 0 {
+		return ""
+	}
+	peerID = strings.TrimSpace(peerID)
+	if peerID == "" {
+		return ""
+	}
+
+	candidates := make(map[string]struct{})
+	rawCandidate := strings.ToLower(peerID)
+	if rawCandidate != "" {
+		candidates[rawCandidate] = struct{}{}
+	}
+	channel = strings.ToLower(strings.TrimSpace(channel))
+	if channel != "" {
+		candidates[channel+":"+rawCandidate] = struct{}{}
+	}
+	if idx := strings.Index(rawCandidate, ":"); idx > 0 && idx < len(rawCandidate)-1 {
+		candidates[rawCandidate[idx+1:]] = struct{}{}
+	}
+
+	for canonical, ids := range identityLinks {
+		canonical = strings.TrimSpace(canonical)
+		if canonical == "" {
+			continue
+		}
+		for _, id := range ids {
+			normalized := strings.ToLower(strings.TrimSpace(id))
+			if normalized == "" {
+				continue
+			}
+			if _, ok := candidates[normalized]; ok {
+				return canonical
+			}
+		}
+	}
+
+	return ""
+}

pkg/session/allocator.go

@@ -44,6 +44,7 @@ func AllocateRouteSession(input AllocationInput) Allocation {
 
 func buildSessionScope(input AllocationInput) SessionScope {
 	inbound := input.Context
+	includeTopicInChatDimension := shouldPreserveTelegramForumIsolation(input)
 	scope := SessionScope{
 		Version: ScopeVersionV1,
 		AgentID: routing.NormalizeAgentID(input.AgentID),
@@ -73,6 +74,11 @@ func buildSessionScope(input AllocationInput) SessionScope {
 			if chatID == "" {
 				continue
 			}
+			if includeTopicInChatDimension {
+				if topicID := strings.TrimSpace(inbound.TopicID); topicID != "" {
+					chatID = chatID + "/" + topicID
+				}
+			}
 			chatType := strings.ToLower(strings.TrimSpace(inbound.ChatType))
 			if chatType == "" {
 				chatType = "direct"
@@ -111,18 +117,16 @@ func buildLegacySessionAliases(input AllocationInput) []string {
 	inbound := input.Context
 
 	if strings.EqualFold(strings.TrimSpace(inbound.ChatType), "direct") {
-		senderID := CanonicalSessionIdentityID(
-			inbound.Channel,
-			inbound.SenderID,
-			input.SessionPolicy.IdentityLinks,
-		)
-		if senderID == "" {
+		peerIDs := buildLegacyDirectPeerIDs(input)
+		if len(peerIDs) == 0 {
 			return uniqueAliases(aliases)
 		}
-		aliases = append(
-			aliases,
-			BuildLegacyDirectAliases(input.AgentID, inbound.Channel, inbound.Account, senderID)...,
-		)
+		for _, peerID := range peerIDs {
+			aliases = append(
+				aliases,
+				BuildLegacyDirectAliases(input.AgentID, inbound.Channel, inbound.Account, peerID)...,
+			)
+		}
 		return uniqueAliases(aliases)
 	}
 
@@ -143,6 +147,48 @@ func buildLegacySessionAliases(input AllocationInput) []string {
 	return uniqueAliases(aliases)
 }
 
+func shouldPreserveTelegramForumIsolation(input AllocationInput) bool {
+	inbound := input.Context
+	if !strings.EqualFold(strings.TrimSpace(inbound.Channel), "telegram") {
+		return false
+	}
+	if strings.TrimSpace(inbound.TopicID) == "" {
+		return false
+	}
+	for _, dimension := range input.SessionPolicy.Dimensions {
+		if strings.EqualFold(strings.TrimSpace(dimension), "topic") {
+			return false
+		}
+	}
+	return true
+}
+
+func buildLegacyDirectPeerIDs(input AllocationInput) []string {
+	inbound := input.Context
+	peerIDs := make([]string, 0, 3)
+
+	rawSenderID := strings.TrimSpace(inbound.SenderID)
+	if rawSenderID != "" {
+		peerIDs = append(peerIDs, strings.ToLower(rawSenderID))
+	}
+
+	canonicalSenderID := CanonicalSessionIdentityID(
+		inbound.Channel,
+		inbound.SenderID,
+		input.SessionPolicy.IdentityLinks,
+	)
+	if canonicalSenderID != "" {
+		peerIDs = append(peerIDs, canonicalSenderID)
+	}
+
+	chatID := strings.TrimSpace(inbound.ChatID)
+	if chatID != "" {
+		peerIDs = append(peerIDs, strings.ToLower(chatID))
+	}
+
+	return uniqueAliases(peerIDs)
+}
+
 func uniqueAliases(aliases []string) []string {
 	if len(aliases) == 0 {
 		return nil

pkg/session/allocator_test.go

@@ -80,6 +80,65 @@ func TestAllocateRouteSession_GroupPeer(t *testing.T) {
 	}
 }
 
+func TestAllocateRouteSession_TelegramForumTopicsRemainIsolatedByDefault(t *testing.T) {
+	first := AllocateRouteSession(AllocationInput{
+		AgentID: "main",
+		Context: bus.InboundContext{
+			Channel:  "telegram",
+			ChatID:   "-1001234567890",
+			ChatType: "group",
+			TopicID:  "42",
+			SenderID: "7",
+		},
+		SessionPolicy: routing.SessionPolicy{
+			Dimensions: []string{"chat"},
+		},
+	})
+	second := AllocateRouteSession(AllocationInput{
+		AgentID: "main",
+		Context: bus.InboundContext{
+			Channel:  "telegram",
+			ChatID:   "-1001234567890",
+			ChatType: "group",
+			TopicID:  "99",
+			SenderID: "7",
+		},
+		SessionPolicy: routing.SessionPolicy{
+			Dimensions: []string{"chat"},
+		},
+	})
+
+	if first.SessionKey == second.SessionKey {
+		t.Fatalf("forum topics should not share default session key: %q", first.SessionKey)
+	}
+	if got := first.Scope.Values["chat"]; got != "group:-1001234567890/42" {
+		t.Fatalf("first.Scope.Values[chat] = %q, want %q", got, "group:-1001234567890/42")
+	}
+	if got := second.Scope.Values["chat"]; got != "group:-1001234567890/99" {
+		t.Fatalf("second.Scope.Values[chat] = %q, want %q", got, "group:-1001234567890/99")
+	}
+}
+
+func TestAllocateRouteSession_PicoDirectAliasesIncludeLegacyChatKey(t *testing.T) {
+	allocation := AllocateRouteSession(AllocationInput{
+		AgentID: "main",
+		Context: bus.InboundContext{
+			Channel:  "pico",
+			Account:  "default",
+			ChatID:   "pico:session-123",
+			ChatType: "direct",
+			SenderID: "pico-user",
+		},
+		SessionPolicy: routing.SessionPolicy{
+			Dimensions: []string{"sender"},
+		},
+	})
+
+	if !containsAlias(allocation.SessionAliases, "agent:main:pico:direct:pico:session-123") {
+		t.Fatalf("SessionAliases = %v, want pico legacy alias", allocation.SessionAliases)
+	}
+}
+
 func TestBuildOpaqueSessionKey_IsStable(t *testing.T) {
 	first := BuildOpaqueSessionKey("agent:main:direct:user123")
 	second := BuildOpaqueSessionKey("agent:main:direct:user123")

pkg/session/jsonl_backend.go

@@ -84,6 +84,13 @@ func (b *JSONLBackend) EnsureSessionMetadata(sessionKey string, scope *SessionSc
 		return
 	}
 
+	canonicalMeta, metaErr := metaStore.GetSessionMeta(ctx, sessionKey)
+	if metaErr != nil {
+		log.Printf("session: get canonical session metadata: %v", metaErr)
+	} else if canonicalMeta.Count > 0 || strings.TrimSpace(canonicalMeta.Summary) != "" {
+		return
+	}
+
 	canonicalHistory, historyErr := b.store.GetHistory(ctx, sessionKey)
 	if historyErr != nil {
 		log.Printf("session: get canonical history: %v", historyErr)

pkg/session/jsonl_backend_test.go

@@ -4,8 +4,10 @@ import (
 	"fmt"
 	"testing"
 
+	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/memory"
 	"github.com/sipeed/picoclaw/pkg/providers"
+	"github.com/sipeed/picoclaw/pkg/routing"
 	"github.com/sipeed/picoclaw/pkg/session"
 )
 
@@ -239,3 +241,44 @@ func TestJSONLBackend_EnsureSessionMetadata_PromotesLegacyAliasHistory(t *testin
 		t.Fatalf("promoted summary = %q, want %q", summary, "legacy summary")
 	}
 }
+
+func TestJSONLBackend_EnsureSessionMetadata_PromotesLegacyPicoDirectAliasHistory(t *testing.T) {
+	b := newBackend(t)
+
+	legacyKey := "agent:main:pico:direct:pico:session-123"
+	b.AddMessage(legacyKey, "user", "legacy pico history")
+
+	scope := &session.SessionScope{
+		Version:    session.ScopeVersionV1,
+		AgentID:    "main",
+		Channel:    "pico",
+		Account:    "default",
+		Dimensions: []string{"sender"},
+		Values: map[string]string{
+			"sender": "pico-user",
+		},
+	}
+	allocation := session.AllocateRouteSession(session.AllocationInput{
+		AgentID: "main",
+		Context: bus.InboundContext{
+			Channel:  "pico",
+			Account:  "default",
+			ChatID:   "pico:session-123",
+			ChatType: "direct",
+			SenderID: "pico-user",
+		},
+		SessionPolicy: routing.SessionPolicy{
+			Dimensions: []string{"sender"},
+		},
+	})
+
+	b.EnsureSessionMetadata(allocation.SessionKey, scope, allocation.SessionAliases)
+
+	if got := b.ResolveSessionKey(legacyKey); got != allocation.SessionKey {
+		t.Fatalf("ResolveSessionKey() = %q, want %q", got, allocation.SessionKey)
+	}
+	history := b.GetHistory(allocation.SessionKey)
+	if len(history) != 1 || history[0].Content != "legacy pico history" {
+		t.Fatalf("promoted history = %+v", history)
+	}
+}