chore: track agentctl avatar and displayname commands

Añade avatar.go que implementa los subcomandos avatar y displayname
de agentctl. Ya existía en el proyecto pero no estaba commiteado.

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

cmd/agentctl/avatar.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/cobra"
+
+	"github.com/enmanuel/agents/internal/config"
+	shellmatrix "github.com/enmanuel/agents/shell/matrix"
+)
+
+func avatarCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "avatar <agent-id> <image-path>",
+		Short: "Upload an image and set it as the bot's Matrix avatar",
+		Args:  cobra.ExactArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			agentID, imagePath := args[0], args[1]
+
+			cfg, err := loadMatrixCfg(agentID)
+			if err != nil {
+				return err
+			}
+
+			client, err := shellmatrix.New(cfg.Matrix)
+			if err != nil {
+				return fmt.Errorf("matrix client: %w", err)
+			}
+
+			uri, err := client.SetAvatar(context.Background(), imagePath)
+			if err != nil {
+				return err
+			}
+
+			fmt.Printf("ok    %-20s  avatar → %s\n", agentID, uri)
+			return nil
+		},
+	}
+}
+
+func displaynameCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "displayname <agent-id> [name]",
+		Short: "Set the bot's Matrix display name (defaults to agent.name in config)",
+		Args:  cobra.RangeArgs(1, 2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			agentID := args[0]
+
+			cfg, err := loadMatrixCfg(agentID)
+			if err != nil {
+				return err
+			}
+
+			name := cfg.Agent.Name
+			if len(args) == 2 {
+				name = args[1]
+			}
+			if name == "" {
+				return fmt.Errorf("no name provided and agent.name is empty in config")
+			}
+
+			client, err := shellmatrix.New(cfg.Matrix)
+			if err != nil {
+				return fmt.Errorf("matrix client: %w", err)
+			}
+
+			if err := client.SetDisplayName(context.Background(), name); err != nil {
+				return err
+			}
+
+			fmt.Printf("ok    %-20s  displayname → %q\n", agentID, name)
+			return nil
+		},
+	}
+}
+
+// loadMatrixCfg locates the config for the given agent ID and returns it with
+// Matrix-relevant env vars expanded. Does not run full LLM/tool validation so
+// the command works even when OPENAI_API_KEY etc. are not set.
+func loadMatrixCfg(agentID string) (*config.AgentConfig, error) {
+	matches, err := filepath.Glob(agentsGlob)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, path := range matches {
+		cfg, err := config.LoadMeta(path)
+		if err != nil {
+			continue
+		}
+		if cfg.Agent.ID != agentID {
+			continue
+		}
+
+		// Expand only the fields the Matrix client needs.
+		cfg.Matrix.Homeserver = os.ExpandEnv(cfg.Matrix.Homeserver)
+		cfg.Matrix.UserID = os.ExpandEnv(cfg.Matrix.UserID)
+		return cfg, nil
+	}
+
+	return nil, fmt.Errorf("agent %q not found under agents/*/config.yaml", agentID)
+}