add opus 4.7 for claude computer use

[NikhilShahi]

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Note

Low Risk
Type-only surface area expansion plus a version bump; no runtime logic changes.

Overview
Adds "claude-opus-4-7" to the ClaudeComputerUseLlm union type so callers can select this model for Claude computer-use tasks.

Bumps the package version from 0.89.3 to 0.89.4.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.