docs: pin installation Zod to compatible 4.4 minor

[miguelg719]

Summary

• Follow up on docs: pin quickstart and installation Zod to compatible 4.4 minor #2922, which merged before the installation doc update.
• Pin Zod to ~4.4.3 in all v4 installation commands (pnpm, npm, Yarn, and Bun), matching the quickstart.
• Allow patch updates while avoiding the reproduced cross-minor extract() TypeScript incompatibility.

Verification

• git diff --check HEAD^ HEAD passed.
• Docs-only change; full docs validation not run.

---

Summary by cubic

Pins Zod to ~4.4.3 in all v4 installation commands to avoid a cross-minor TypeScript incompatibility with extract(). This matches the quickstart and allows patch updates while preventing the breaking change.

^{Written for commit 90e1bbf. Summary will update on new commits.}

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 90e1bbf

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}