enhance: channel-aware identity line, remove model leak from system prompt

Remove hardcoded "personal assistant running inside GoClaw" identity.
Replace with channel+peer-aware context: "running in Telegram (a group chat)".
Remove model name from Runtime section to prevent leaking provider info.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/agent/loop.go

@@ -30,6 +30,7 @@ func (l *Loop) Run(ctx context.Context, req RunRequest) (*RunResult, error) {
 
 	// Per-run emit wrapper: enriches every AgentEvent with delegation + routing context.
 	emitRun := func(event AgentEvent) {
+		event.RunKind = req.RunKind
 		event.DelegationID = req.DelegationID
 		event.TeamID = req.TeamID
 		event.TeamTaskID = req.TeamTaskID
@@ -151,6 +152,7 @@ func (l *Loop) Run(ctx context.Context, req RunRequest) (*RunResult, error) {
 func (l *Loop) runLoop(ctx context.Context, req RunRequest) (*RunResult, error) {
 	// Per-run emit wrapper: enriches every AgentEvent with delegation + routing context.
 	emitRun := func(event AgentEvent) {
+		event.RunKind = req.RunKind
 		event.DelegationID = req.DelegationID
 		event.TeamID = req.TeamID
 		event.TeamTaskID = req.TeamTaskID
@@ -288,7 +290,7 @@ func (l *Loop) runLoop(ctx context.Context, req RunRequest) (*RunResult, error)
 
 	// buildMessages resolves context files once and also detects BOOTSTRAP.md presence
 	// (hadBootstrap) — no extra DB roundtrip needed for bootstrap detection.
-	messages, hadBootstrap := l.buildMessages(ctx, history, summary, req.Message, req.ExtraSystemPrompt, req.SessionKey, req.Channel, req.UserID, req.HistoryLimit, req.SkillFilter)
+	messages, hadBootstrap := l.buildMessages(ctx, history, summary, req.Message, req.ExtraSystemPrompt, req.SessionKey, req.Channel, req.PeerKind, req.UserID, req.HistoryLimit, req.SkillFilter)
 
 	// 2. Attach vision images to the current user message (last in messages slice).
 	// Images are only attached to the live request, NOT persisted in session history.

internal/agent/loop_history.go

@@ -18,7 +18,7 @@ import (
 // buildMessages constructs the full message list for an LLM request.
 // Returns the messages and whether BOOTSTRAP.md was present in context files
 // (used by the caller for auto-cleanup without an extra DB roundtrip).
-func (l *Loop) buildMessages(ctx context.Context, history []providers.Message, summary, userMessage, extraSystemPrompt, sessionKey, channel, userID string, historyLimit int, skillFilter []string) ([]providers.Message, bool) {
+func (l *Loop) buildMessages(ctx context.Context, history []providers.Message, summary, userMessage, extraSystemPrompt, sessionKey, channel, peerKind, userID string, historyLimit int, skillFilter []string) ([]providers.Message, bool) {
 	var messages []providers.Message
 
 	// Build full system prompt using the new builder (matching TS buildAgentSystemPrompt)
@@ -69,6 +69,7 @@ func (l *Loop) buildMessages(ctx context.Context, history []providers.Message, s
 		Model:                  l.model,
 		Workspace:              promptWorkspace,
 		Channel:                channel,
+		PeerKind:               peerKind,
 		OwnerIDs:               l.ownerIDs,
 		Mode:                   mode,
 		ToolNames:              l.tools.List(),

internal/agent/systemprompt.go

@@ -24,6 +24,7 @@ type SystemPromptConfig struct {
 	Model         string
 	Workspace     string
 	Channel       string                 // runtime channel (telegram, discord, etc.)
+	PeerKind      string                 // "direct" or "group"
 	OwnerIDs      []string               // owner sender IDs
 	Mode          PromptMode             // full or minimal
 	ToolNames     []string               // registered tool names
@@ -72,9 +73,15 @@ func BuildSystemPrompt(cfg SystemPromptConfig) string {
 	isMinimal := cfg.Mode == PromptMinimal
 	var lines []string
 
-	// 1. Identity
-	lines = append(lines, "You are a personal assistant running inside GoClaw.")
-	lines = append(lines, "")
+	// 1. Identity — channel-aware context
+	if cfg.Channel != "" {
+		chatType := "a direct chat"
+		if cfg.PeerKind == "group" {
+			chatType = "a group chat"
+		}
+		lines = append(lines, fmt.Sprintf("You are a personal assistant running in %s (%s).", cfg.Channel, chatType))
+		lines = append(lines, "")
+	}
 
 	// 1.5. First-run bootstrap override (must be early so model sees it first)
 	if hasBootstrapFile(cfg.ContextFiles) {

internal/agent/systemprompt_sections.go

@@ -218,9 +218,6 @@ func buildRuntimeSection(cfg SystemPromptConfig) []string {
 	if cfg.AgentID != "" {
 		parts = append(parts, fmt.Sprintf("agent=%s", cfg.AgentID))
 	}
-	if cfg.Model != "" {
-		parts = append(parts, fmt.Sprintf("model=%s", cfg.Model))
-	}
 	if cfg.Channel != "" {
 		parts = append(parts, fmt.Sprintf("channel=%s", cfg.Channel))
 	}