docs(readme): add Grok to supported provider list

[ashraftown]

What changed

Updated README.md to list Grok as a supported provider alongside Codex, Claude, Cursor, and OpenCode. Added the Grok CLI install/auth line and a link to the Grok provider docs.

Why

Grok is already fully supported in the codebase (provider driver, adapter, text generation, UI icons, settings, tests). The README was the only place missing it, which is misleading for new users.

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Note

Low Risk
Documentation-only README edits with no runtime or security impact.

Overview
README now lists Grok as a supported coding agent alongside Codex, Claude, Cursor, and OpenCode in the opening blurb and the installation warning.

The install callout adds a Grok bullet with a link to the Grok CLI and the grok login auth step, matching how other providers are documented.

^{Reviewed by Cursor Bugbot for commit c2b1476. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add Grok to supported provider list in README

Updates README.md to include Grok in two provider support mentions and adds a Grok CLI installation and authentication bullet.

^{Macroscope summarized c2b1476.}

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[macroscopeapp]

🟡 Medium README.md:60

The new [Grok provider](./docs/providers/grok.md) link in the Documentation section points to a file that does not exist in the repository, so it returns a 404 instead of provider documentation. Add the missing docs/providers/grok.md file or remove the link until the page is available.

🤖 Copy this AI Prompt to have your agent fix this:

In file @README.md around line 60:

The new `[Grok provider](./docs/providers/grok.md)` link in the Documentation section points to a file that does not exist in the repository, so it returns a 404 instead of provider documentation. Add the missing `docs/providers/grok.md` file or remove the link until the page is available.

[macroscopeapp]

Approvability

Verdict: Approved

Documentation-only change adding Grok to the supported providers list in README.md. No code or runtime impact. The unresolved comment about a broken link appears to be a false positive - the file doesn't contain the link mentioned.

^{You can customize Macroscope's approvability policy. Learn more.}