CLI: Add Opus 4.7 support to code agent with max effort thinking

[youknowriad]

Related issues

• Related to support for the newly released Opus 4.7 model in the CLI code agent.

How AI was used in this PR

Claude Code (running on Opus 4.7) located the model registry and wired itself in. I reviewed the two-line diff in agent.ts.

Proposed Changes

• Add claude-opus-4-7 (label: "Opus 4.7") to AI_MODELS in apps/cli/ai/agent.ts. The /model picker, status line, session-resume validator, and AiModelId type all derive from this object and pick up the new entry automatically.
• Pass effort: 'max' to the Agent SDK query() when the selected model is any Opus variant (matches claude-opus-*). Sonnet stays on the SDK default ('high') since 'max' is currently documented as Opus-only.

Testing Instructions

• npm run cli:build
• Launch the CLI code agent and run /model — confirm "Opus 4.7" appears, select it, and verify the status line switches to "Opus 4.7".
• Send a prompt and confirm Opus 4.7 responds. (Max-effort thinking should take effect; unverified whether the SDK fully supports 'max' on 4.7 yet — if the API errors, we can narrow the gate to claude-opus-4-6.)

Pre-merge Checklist

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

[wpmobilebot]

📊 Performance Test Results

Comparing dcaec9c vs trunk

app-size

Metric	trunk	dcaec9c	Diff	Change
App Size (Mac)	1283.06 MB	1283.07 MB	+0.01 MB	⚪ 0.0%

site-editor

Metric	trunk	dcaec9c	Diff	Change
load	1874 ms	1925 ms	+51 ms	🔴 2.7%

site-startup

Metric	trunk	dcaec9c	Diff	Change
siteCreation	8100 ms	8119 ms	+19 ms	⚪ 0.0%
siteStartup	4934 ms	4955 ms	+21 ms	⚪ 0.0%

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Results are median values from multiple test runs.

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