refactor: dedupe extension lowercase readers

extensions/github-copilot/models.ts

@@ -3,6 +3,7 @@ import type {
   ProviderRuntimeModel,
 } from "openclaw/plugin-sdk/core";
 import { normalizeModelCompat } from "openclaw/plugin-sdk/provider-model-shared";
+import { normalizeOptionalLowercaseString } from "openclaw/plugin-sdk/text-runtime";
 
 export const PROVIDER_ID = "github-copilot";
 const CODEX_GPT_54_MODEL_ID = "gpt-5.4";
@@ -14,7 +15,7 @@ const DEFAULT_MAX_TOKENS = 8192;
 export function resolveCopilotTransportApi(
   modelId: string,
 ): "anthropic-messages" | "openai-responses" {
-  return modelId.trim().toLowerCase().includes("claude")
+  return (normalizeOptionalLowercaseString(modelId) ?? "").includes("claude")
     ? "anthropic-messages"
     : "openai-responses";
 }
@@ -28,14 +29,15 @@ export function resolveCopilotForwardCompatModel(
   }
 
   // If the model is already in the registry, let the normal path handle it.
-  const existing = ctx.modelRegistry.find(PROVIDER_ID, trimmedModelId.toLowerCase());
+  const lowerModelId = normalizeOptionalLowercaseString(trimmedModelId) ?? "";
+  const existing = ctx.modelRegistry.find(PROVIDER_ID, lowerModelId);
   if (existing) {
     return undefined;
   }
 
   // For gpt-5.4 specifically, clone from the gpt-5.2-codex template
   // to preserve any special settings the registry has for codex models.
-  if (trimmedModelId.toLowerCase() === CODEX_GPT_54_MODEL_ID) {
+  if (lowerModelId === CODEX_GPT_54_MODEL_ID) {
     for (const templateId of CODEX_TEMPLATE_MODEL_IDS) {
       const template = ctx.modelRegistry.find(
         PROVIDER_ID,
@@ -58,7 +60,6 @@ export function resolveCopilotForwardCompatModel(
   // model isn't available on the user's plan. This lets new models be used
   // by simply adding them to agents.defaults.models in openclaw.json — no
   // code change required.
-  const lowerModelId = trimmedModelId.toLowerCase();
   const reasoning = /^o[13](\b|$)/.test(lowerModelId);
   return normalizeModelCompat({
     id: trimmedModelId,