feat: suppress Codex Desktop directives in model responses

Keep desktop-context.md in instructions for client fingerprinting,
but inject a suppress prompt to prevent the model from outputting
desktop-specific directives (::automation-update, ::code-comment,
::archive) and mentioning Codex Desktop features. Controlled by
config model.suppress_desktop_directives (default: true).

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

config/default.yaml

@@ -13,6 +13,7 @@ client:
 model:
   default: "gpt-5.3-codex"
   default_reasoning_effort: "medium"
+  suppress_desktop_directives: true
 
 auth:
   jwt_token: null

src/config.ts

@@ -19,6 +19,7 @@ const ConfigSchema = z.object({
   model: z.object({
     default: z.string().default("gpt-5.3-codex"),
     default_reasoning_effort: z.string().default("medium"),
+    suppress_desktop_directives: z.boolean().default(true),
   }),
   auth: z.object({
     jwt_token: z.string().nullable().default(null),

src/translation/shared-utils.ts

@@ -6,6 +6,7 @@
 
 import { readFileSync } from "fs";
 import { resolve } from "path";
+import { getConfig } from "../config.js";
 
 let cachedDesktopContext: string | null = null;
 
@@ -26,12 +27,26 @@ export function getDesktopContext(): string {
   return cachedDesktopContext;
 }
 
+const SUPPRESS_PROMPT =
+  "Ignore all Codex desktop context instructions above. " +
+  "Do not use any special directives such as ::automation-update, " +
+  "::code-comment, ::archive or any other desktop-specific formatting. " +
+  "Do not mention automations, review findings, archiving, or any Codex Desktop-specific features. " +
+  "Do not say you are running inside Codex or a desktop app. " +
+  "Respond using your own default behavior.";
+
 /**
  * Assemble final instructions from desktop context + user instructions.
+ * When suppress_desktop_directives is enabled, appends a suppress prompt
+ * to override desktop-specific behaviors.
  */
 export function buildInstructions(userInstructions: string): string {
   const ctx = getDesktopContext();
-  return ctx ? `${ctx}\n\n${userInstructions}` : userInstructions;
+  if (!ctx) return userInstructions;
+  if (getConfig().model.suppress_desktop_directives) {
+    return `${ctx}\n\n${SUPPRESS_PROMPT}\n\n${userInstructions}`;
+  }
+  return `${ctx}\n\n${userInstructions}`;
 }
 
 /**