feat: agent color cfg (#4226)

Co-authored-by: 0xrin <0xrin1@protonmail.com>
Co-authored-by: GitHub Action <action@github.com>

packages/opencode/src/config/config.ts

@@ -355,6 +355,11 @@ export namespace Config {
       disable: z.boolean().optional(),
       description: z.string().optional().describe("Description of when to use the agent"),
       mode: z.union([z.literal("subagent"), z.literal("primary"), z.literal("all")]).optional(),
+      color: z
+        .string()
+        .regex(/^#[0-9a-fA-F]{6}$/, "Invalid hex color format")
+        .optional()
+        .describe("Hex color code for the agent (e.g., #FF5733)"),
       permission: z
         .object({
           edit: Permission.optional(),