Remove Opus 4.7 model from Studio Code agent

[wojtekn]

Related issues

• N/A

How AI was used in this PR

Authored with Claude Code. It removed the model registry entry and verified the change with eslint and the TypeScript type checker. The author reviewed the change.

Proposed Changes

Removes the Opus 4.7 option from the Studio Code agent model picker, leaving Sonnet 4.6 and Opus 4.8 as the available Anthropic models. Since the registry is centralized, this single change propagates to the model picker, provider availability, and session model validation (sessions pinned to Opus 4.7 auto-fall back to the default model).

The default model (Sonnet 4.6) is unaffected.

Testing Instructions

• Open the Studio Code agent chat composer and confirm Opus 4.7 no longer appears in the model picker.
• Confirm Sonnet 4.6 and Opus 4.8 are still selectable and turns run.
• npm run typecheck passes.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[katinthehatsite]

Looks good 👍

[wpmobilebot]

📊 Performance Test Results

Comparing 69ebb97 vs trunk

app-size

Metric	trunk	69ebb97	Diff	Change
App Size (Mac)	1328.52 MB	1328.52 MB	0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	69ebb97	Diff	Change
load	1714 ms	1759 ms	+45 ms	⚪ 0.0%

site-startup

Metric	trunk	69ebb97	Diff	Change
siteCreation	8503 ms	8531 ms	+28 ms	⚪ 0.0%
siteStartup	3873 ms	3870 ms	3 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)