Partially updates deposit_configs.overrides on an active deposit program attachment using three-state PATCH semantics. At the program scope only renewal_term is accepted.

• Omitted: Keeps the current value
• null: Removes the override; falls back through the cascade (product)
• Value: Replaces the current renewal_term

NOTES:

• Sending penalties returns 400 EIBACC0317
• Sending maturity_instructions returns 400 EIBACC0318 and must be applied per-account instead
• An empty overrides envelope returns 400 EIBACC0315
• renewal_term still requires ROLLOVER configured in maturity_instructions somewhere in the fallback sequence (400 EIBACC0310 otherwise)

This endpoint generates a Program attachment updated event.