Add official support for grok Build (xAI)

[adamouabakar]

Add official support for Grok Build (xAI)

What was added:

• New host configuration file hosts/grok-build.ts
• Updated hosts/index.ts to register the new host
• Generated and adapted 55+ skills for Grok Build compatibility
• Path rewrites, tool rewrites (browser → subagents), and Windows support

Tested successfully on:

• Windows + Grok Build CLI
• Core commands like /office-hours, /plan-ceo-review, /review, /cso are working

Why this contribution?
Grok Build is gaining popularity in the xAI ecosystem. This makes GStack natively plug-and-play for Grok users, similar to Claude Code, Cursor, and others.

It allows solopreneurs and developers using Grok to fully benefit from Garry Tan’s structured workflows (YC Office Hours, reviews, QA, etc.).

Ready to merge.

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[jbetala7]

Thanks for adding Grok Build support. The host layer here — hosts/grok-build.ts plus the ALL_HOST_CONFIGS registration in hosts/index.ts — is exactly the right shape and is only ~50 lines. The blocker is the other ~66k lines: this PR commits the generated .grok/skills/** output (55 SKILL.md files), and no other host does that.

• git ls-files | grep -E '^\.(codex|cursor)/skills/' returns 0 on main — generated host skills are never checked in; they're produced from the HostConfig by the generator at install/generation time. .cursor/ is even listed in .gitignore.
• The committed per-host convention is a single golden fixture: test/fixtures/golden/{claude,codex,factory,gbrain,hermes,openclaw}-ship-SKILL.md, wired into the host-config golden test. There's no grok-build-ship-SKILL.md here.

To make this reviewable and mergeable:

1. Drop all .grok/skills/** files, and add .grok/skills/ to .gitignore so they don't get recommitted.
2. Add test/fixtures/golden/grok-build-ship-SKILL.md and include grok-build in the host-config golden test the same way the other hosts are.
3. Follow the version convention: prefix the title with the next vX.Y.Z.Z, bump VERSION, and add a CHANGELOG.md entry — the "Sync PR title to VERSION" check keys on this.

Heads-up on overlap: #2016 also touches "grok" but is orthogonal — it adds a /grok skill that calls Grok from inside Claude Code, whereas this PR adds Grok Build as a host that runs gstack. They don't collide, but coordinating naming would help future readers.

After trimming, the real diff is the two .ts files plus one fixture, which is easy to review. Happy to re-check once it's slimmed down.

[adamouabakar]

Thanks for the detailed feedback, @jbeta7 !

I have cleaned up the pull request. :

-Removed all generated files in .grok/skills/**

• Added .grok/skills/ to .gitignore
  -Added the golden fixture test/fixtures/golden/grok-build-ship-SKILL.md
• Updated the commit with the clear message

The pull request is now very lightweight and follows the convention of the other hosts.

Ready for review/merge. Thanks !