fix: rename system to instructions

[lgrammel]

Background

With agents, the typical name of what used to be system has become instructions. ToolLoopAgent already uses instructions.

Summary

• Introduce instructions property on generateText etc that replaces system
• Mark system as deprecated.

[vercel]

Additional Suggestion:

The streamUI function silently ignores the instructions parameter because it's not destructured from the input or passed to standardizePrompt.

[github-actions]

🚀 Published in:

Package	Version
ai	7.0.0-canary.127
@ai-sdk/alibaba	2.0.0-canary.45
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