Explicit Assignment Intent Safety

What's new in v0.14.3

Safer conversation assignment

• Conversation assignment updates now require explicit { intent: "unassign" } before clearing ownership.
• Assignment requests continue to support direct { operatorId } payloads and now also accept explicit { intent: "assign", operatorId } payloads.
• The inbox assignment menu now sends explicit assign/unassign intent from operator actions.

Regression coverage

• Added route coverage for empty bodies, ambiguous payloads, explicit unassign, and assign requests so missing operatorId values cannot silently unassign a conversation.