fix(daemon): include dispatched agent identity in CLAUDE.md

When an agent is triggered via @mention (not as the issue assignee),
the generated CLAUDE.md had no explicit agent identity. The agent would
infer its identity from the issue's assignee field, causing it to skip
work intended for it.

Now CLAUDE.md always includes "You are: <agent-name> (ID: <agent-id>)"
so the agent knows exactly who it is regardless of the issue assignee.

Closes MUL-709

server/internal/daemon/daemon.go

@@ -894,9 +894,11 @@ func (d *Daemon) runTask(ctx context.Context, task Task, provider string, taskLo
 	}
 
 	agentName := "agent"
+	var agentID string
 	var skills []SkillData
 	var instructions string
 	if task.Agent != nil {
+		agentID = task.Agent.ID
 		agentName = task.Agent.Name
 		skills = task.Agent.Skills
 		instructions = task.Agent.Instructions
@@ -908,6 +910,7 @@ func (d *Daemon) runTask(ctx context.Context, task Task, provider string, taskLo
 	taskCtx := execenv.TaskContextForEnv{
 		IssueID:           task.IssueID,
 		TriggerCommentID:  task.TriggerCommentID,
+		AgentID:           agentID,
 		AgentName:         agentName,
 		AgentInstructions: instructions,
 		AgentSkills:       convertSkillsForEnv(skills),

server/internal/daemon/execenv/execenv.go

@@ -32,6 +32,7 @@ type PrepareParams struct {
 type TaskContextForEnv struct {
 	IssueID           string
 	TriggerCommentID  string // comment that triggered this task (empty for on_assign)
+	AgentID           string // unique ID of the dispatched agent
 	AgentName         string
 	AgentInstructions string // agent identity/persona instructions, injected into CLAUDE.md
 	AgentSkills       []SkillContextForEnv

server/internal/daemon/execenv/runtime_config.go

@@ -36,8 +36,22 @@ func buildMetaSkillContent(provider string, ctx TaskContextForEnv) string {
 	b.WriteString("# Multica Agent Runtime\n\n")
 	b.WriteString("You are a coding agent in the Multica platform. Use the `multica` CLI to interact with the platform.\n\n")
 
-	// Inject agent identity instructions before workflow commands.
-	if ctx.AgentInstructions != "" {
+	// Always emit agent identity so the agent knows who it is, even when
+	// dispatched via @mention on an issue assigned to a different agent.
+	if ctx.AgentName != "" || ctx.AgentID != "" {
+		b.WriteString("## Agent Identity\n\n")
+		if ctx.AgentName != "" {
+			fmt.Fprintf(&b, "**You are: %s**", ctx.AgentName)
+			if ctx.AgentID != "" {
+				fmt.Fprintf(&b, " (ID: `%s`)", ctx.AgentID)
+			}
+			b.WriteString("\n\n")
+		}
+		if ctx.AgentInstructions != "" {
+			b.WriteString(ctx.AgentInstructions)
+			b.WriteString("\n\n")
+		}
+	} else if ctx.AgentInstructions != "" {
 		b.WriteString("## Agent Identity\n\n")
 		b.WriteString(ctx.AgentInstructions)
 		b.WriteString("\n\n")