v1.6.0

What changed

• update to @sogni-ai/sogni-client 4.1.0-alpha.5
• expose wrapper helpers for current account, tracked projects, wallet balances, and chat tool execution
• re-export multimodal chat and tool-execution types
• add vision chat example and expand README coverage for vision/thinking/tool execution flows
• add unit coverage for the new wrapper surface

Verification

• npm run build
• npm test
• npm run typecheck:examples