feat: add gemini yolo mode

[Next2012]

No description provided.

[github-actions]

Review mode: initial

Findings:

• MAJOR: Safe-yolo mapped to --yolo in Gemini ACP; escalates permissions beyond Safe Yolo. See inline.

Testing: Not run (automation)

[github-actions]

[MAJOR] Safe-yolo currently maps to full --yolo, collapsing Safe Yolo into Yolo and bypassing intended safeguards. Suggest mapping safe-yolo to the same approval mode as local launcher (auto_edit) and reserving --yolo for yolo.

Suggested fix:

if (opts.permissionMode === 'safe-yolo') {
    args.push('--approval-mode', 'auto_edit');
} else if (opts.permissionMode === 'yolo') {
    args.push('--yolo');
}