Document workflow rate limits

[mintlify]

Summary

• Added a new "Limits" section to the workflows documentation
• Documents the 20 runs per 24-hour rolling window limit per workflow
• Notes that failed runs do not count toward this limit

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Note

Low Risk
Documentation-only change with no runtime or behavioral impact.

Overview
Adds a new Limits section to agent/workflows.mdx documenting workflow run rate limits: each workflow is capped at 20 runs per rolling 24-hour window, failed runs don’t count, and runs beyond the limit are rejected until the window expires.

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[ethanpalm]

will be added in #3805