Pin Claude Code version range and model allowlist via managed settings

Claude Code Docs·low signal

Two managed settings landed in June: `requiredMinimumVersion`/`requiredMaximumVersion` (v2.1.163) make Claude Code refuse to start outside an approved version band and point users to the right build, and `enforceAvailableModels` (v2.1.175) constrains the Default model to an `availableModels` allowlist, falling back to the first allowed model. For teams standardizing agent behavior across machines, these prevent silent drift from version or model differences. Set them in managed config rather than relying on everyone updating manually.