feat(agents) : Hugging Face Inference provider first-class support and Together API fix and Direct Injection Refactor Auths [AI-assisted] (#13472)

* initial commit

* removes assesment from docs

* resolves automated review comments

* resolves lint , type , tests , refactors , and submits

* solves : why do we have to lint the tests xD

* adds greptile fixes

* solves a type error

* solves a ci error

* refactors auths

* solves a failing test after i pulled from main lol

* solves a failing test after i pulled from main lol

* resolves token naming issue to comply with better practices when using hf / huggingface

* fixes curly lints !

* fixes failing tests for google api from main

* solve merge conflicts

* solve failing tests with a defensive check 'undefined' openrouterapi key

* fix: preserve Hugging Face auth-choice intent and token behavior (#13472) (thanks @Josephrp)

* test: resolve auth-choice cherry-pick conflict cleanup (#13472)

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Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/agents/model-auth.ts

@@ -287,6 +287,10 @@ export function resolveEnvApiKey(provider: string): EnvApiKeyResult | null {
     return pick("KIMI_API_KEY") ?? pick("KIMICODE_API_KEY");
   }
 
+  if (normalized === "huggingface") {
+    return pick("HUGGINGFACE_HUB_TOKEN") ?? pick("HF_TOKEN");
+  }
+
   const envMap: Record<string, string> = {
     openai: "OPENAI_API_KEY",
     google: "GEMINI_API_KEY",