Harden agent order refund errors

[jynbil1]

Summary

• replace raw refund, refunded-item, order-status, and delivery-request save error responses with generic agent-facing messages
• log detailed validation diagnostics server-side with order/refund model context
• add a shell guard for the refund/order-status hardening slice

/claim #59

Validation

• sh -n tests/check-agent-order-refund-error-responses.sh
• sh tests/check-agent-order-refund-error-responses.sh
• git diff --check
• PHP lint not run: php is not installed in this environment

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