fix(providers): document TRAE_WEB_ORIGIN in .env.example (#12190)

.env.example

@@ -1175,6 +1175,11 @@ CODEX_OAUTH_CLIENT_ID=app_EMoamEEZ73f0CkXaXp7hrann
 # Trae OAuth token override. Used by: open-sse/executors/trae.ts.
 # TRAE_TOKEN=
 
+# Trae web client Origin/Referer override (fleet-wide bump if Trae moves hosts
+# again without a code change). Default: https://work.trae.ai.
+# Used by: open-sse/executors/trae.ts.
+# TRAE_WEB_ORIGIN=https://work.trae.ai
+
 # ── Gemini / Antigravity (Google-based) ──
 # These providers ship public OAuth client_id/secret values embedded in their
 # public CLIs. Defaults are baked into the code via

scripts/check/check-env-doc-sync.mjs

@@ -283,6 +283,7 @@ const ENV_ONLY_ALLOWLIST = new Set([
   "PII_WINDOW_SIZE",
   "TRAE_STREAM_TIMEOUT_MS",
   "TRAE_TOKEN",
+  "TRAE_WEB_ORIGIN",
 ]);
 
 // ─── Parsing helpers ───────────────────────────────────────────────────────