Model aliases now follow availableModels and modelOverrides through one check

An alias is a short model name that Claude Code turns into a specific model. That step now runs through one shared check that applies two settings:

• availableModels, the list of models people are allowed to pick
• modelOverrides, which maps model IDs to your provider's own IDs

Claude Code can also map a custom model ID back to the standard model it stands for. The context window (how much text the model can take in at once) is worked out differently in one new case. When no availableModels entry matches an allowed model, enforceAvailableModels reports "enforceAvailableModels: no availableModels entry expands to an allowed model".