[BUG] Enforce mutual exclusivity for contact person and organisation#714

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rishavtarway wants to merge 2 commits intoaiondemand:developfrom

rishavtarway:fix/518-contact-mutual-exclusivity

Commits on Mar 3, 2026

fix: reject contacts that specify both person and organisation
rishavtarway
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style: apply ruff-format after contact validation changes
rishavtarway
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