[Docs] add go snippets to reference pages

[akeimach]

why

Missing go snippets in the reference files. Also adding the vitest change so this is prevented in the future

what changed

test plan

---

Summary by cubic

Adds Go snippets to the missing v4 reference pages and expands the vitest docs checker to keep TypeScript, Python, and Go in sync. Completes Linear STG-2801 by adding Go to locator, page, context, stagehand, and clipboard.

• New Features

  • Added Go tabs with quick start and API examples to: reference/locator, reference/page, reference/context, reference/stagehand, reference/clipboard; examples show defer cleanup and include Page.URL() usage. Strengthened the vitest checker for Go: parses Go source to validate shared SDK surface coverage, exact method headings, direct parameter lists, response members, and verbatim Go ParamField types; enforces exactly one tab per SDK language per page and flags missing language snippets.

• Bug Fixes

  • Corrected Go docs for Response.HeaderValue() to show (string, bool, error) and clarified header lookup behavior.
  • Formatted Go Clipboard.Paste shortcut options for readability.

^{Written for commit 0f34006. Summary will update on new commits.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0f34006

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[cubic-dev-ai]

cubic analysis

Review completed against the latest diff

Linked issue analysis

Linked issue: STG-2801: Add Go snippets to missing reference docs

Status	Acceptance criteria	Notes
✅	Add Go snippets to reference/locator	The PR adds a section with multiple Go examples (Quick start, Click, Hover, Fill, etc.) to packages/docs/v4/reference/locator.mdx.
✅	Add Go snippets to reference/page	The PR adds a section with many Go examples for page methods (Goto, Click, Hover, Screenshot, etc.) to packages/docs/v4/reference/page.mdx.
✅	Add Go snippets to reference/context	The PR adds a section documenting BrowserContext methods (Pages, NewPage, Cookies, ClearCookies, etc.) in packages/docs/v4/reference/context.mdx.
✅	Add Go snippets to reference/stagehand	The PR adds a section covering Stagehand client and methods (Create, Act, Observe, Extract, ExperimentalBatch, etc.) in packages/docs/v4/reference/stagehand.mdx.
✅	Add Go snippets to reference/clipboard	The PR adds a section with Go examples for clipboard methods (ReadText, WriteText, Clear, Paste, Copy, Cut) in packages/docs/v4/reference/clipboard.mdx.

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[cubic-dev-ai]

All reported issues were addressed across 3 files (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

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[cubic-dev-ai]

All reported issues were addressed across 5 files (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>

[cubic-dev-ai]

All reported issues were addressed across 1 file (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>