Clarify provider setup in README

[Ivorisnoob]

What Changed

Updated the root README setup warning so it no longer implies Codex is required for all T3 Code usage.

The README now:

• explicitly notes that T3 Code supports both Codex and Claude
• documents the login flow for each provider
• keeps the setup guidance aligned with the current multi-provider implementation

Why

The README already described T3 Code as supporting both Codex and Claude, but the warning block still told users they needed Codex CLI for the app to work.

That mismatch made the setup instructions inaccurate and could mislead users into thinking Claude was not actually supported. This change corrects the docs so first-run setup is clearer and consistent with the codebase.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Documentation-only change that updates setup instructions; no code or runtime behavior is affected.

Overview
Updates the README.md warning in How to use to reflect multi-provider support by removing the Codex-only requirement and adding explicit install/auth steps for both Codex (codex login) and Claude (claude auth login).

^{Written by Cursor Bugbot for commit 2e55544. This will update automatically on new commits. Configure here.}

Note

Clarify provider setup instructions for Codex and Claude in README

Updates README.md to document that T3 Code supports both Codex and Claude providers. Replaces the single Codex-only requirement line with explicit installation and authentication steps for each provider.

^{Macroscope summarized 2e55544.}

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