fix: soft error when AI agent reaches max iterations

[centdix]

Summary

• When the AI agent reaches max iterations with pending tool calls, append an error message to the conversation messages instead of returning a hard error
• This allows the job to complete successfully with partial results rather than failing entirely

Test plan

• Run an AI agent flow with a low max_iterations value and tools that always request more calls
• Verify the job completes with the error message in the output messages instead of failing
• Verify normal agent flows (that complete before max iterations) are unaffected

🤖 Generated with Claude Code

[cloudflare-workers-and-pages]

Deploying windmill with    Cloudflare Pages

Latest commit:	035eecc
Status:	✅  Deploy successful!
Preview URL:	https://957cf86f.windmill.pages.dev
Branch Preview URL:	https://soft-error-max-iterations.windmill.pages.dev

View logs