docs: Add more info about free users

[patrikbraborec]

Note

Adds documentation on transparently handling free-plan limitations, including using status messages and graceful exits.

• Docs: Handling free users / limitations
  • Add "Communicating limitations" to platform/actors/development/programming_interface/status_messages.md with guidance to:
    • Use setStatusMessage/exit messages to explain early finishes or failures.
    • Avoid misleading system-like errors.
    • Document limits in README and input schema.
  • Add "Handling free users" to platform/actors/publishing/monetize/index.mdx covering:
    • Upfront communication of limits.
    • Graceful exits with clear status messages (linked section).
    • Avoiding confusion by not presenting policy limits as platform errors.

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