feat: add Grok Build 0.1

[analogpvt]

Summary

• Add xAI Grok Build 0.1 coding model ($1/M input, $2/M output, 256K context) with vision, tools, reasoning

[coderabbitai]

Walkthrough

Adds a grok-build-0-1 model entry to the xAI model registry and a UI changelog documenting Grok Build 0.1 plus DevPass automatic detection/allowlist for 20+ coding agents.

Changes

Grok Build model and changelog

Layer / File(s)	Summary
UI changelog entry apps/ui/src/content/changelog/2026-05-22-grok-build-devpass-agents.md	Adds a changelog file with frontmatter, a "Grok Build 0.1" section (gateway availability, example, Playground link), and a "DevPass Now Works with 20+ Coding Agents" section including the supported-agents table and layered detection signal order.
xAI model registry entry packages/models/src/models/xai.ts	Inserts grok-build-0-1 into xaiModels, specifying metadata, streaming/vision/tools/jsonOutput/reasoning capability flags, pricing tiers (including cached input pricing), and supportedParameters: xaiSupportedParamsNoFreqPresence.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• theopenco/llmgateway#2133: Updates packages/models/src/models/xai.ts with additional xAI model entries (grok-4-3), similar model-registry additions.
• theopenco/llmgateway#2037: Modifies packages/models/src/models/xai.ts pricing fields (e.g., adding cachedInputPrice), related to provider tiering/pricing changes.

Suggested reviewers

• steebchen

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The PR title 'feat: add Grok Build 0.1' is specific and directly describes the primary change, matching the main objective of adding the Grok Build 0.1 model. However, it omits the Imagine models (Image and Video), which are also significant additions documented in the objectives.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@apps/ui/src/content/changelog/2026-05-22-grok-build-devpass-agents.md`:
- Line 34: Update the changelog line to match the model definition: replace
"480p or 720p" with "up to 1080p" and change "Seven aspect ratios supported" to
reflect the actual aspect ratios defined in packages/models/src/models/xai.ts
(the supportedVideoSizes array) — i.e., indicate two aspect ratios (16:9 and
9:16) or list the four video sizes explicitly; ensure the phrasing aligns with
supportedVideoSizes so the docs and model remain consistent.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: dc763e79-14e7-4f0b-ad08-82c66ffeca07

📥 Commits

Reviewing files that changed from the base of the PR and between e8d031c and c59ab30.

📒 Files selected for processing (2)

• apps/ui/src/content/changelog/2026-05-22-grok-build-devpass-agents.md
• packages/models/src/models/xai.ts