Safety: Validate receive address format matches the selected network before sending

[jan3-agent]

Description

When sending funds via SideShift or Changelly, the agent does not validate that the provided receive address matches the expected network. For example, sending USDt on Ethereum but providing a Solana address would proceed without warning, resulting in permanently lost funds with no recovery path.

Steps to reproduce

1. Initiate a send through SideShift or Changelly
2. Specify a destination network (e.g., Ethereum)
3. Provide a receive address for a different network (e.g., Solana)
4. Complete the send transaction

Expected vs actual

• Expected: Agent validates address format against the selected network and warns the user of a mismatch before executing
• Actual: Transaction proceeds without validation or warning

Scope

• SideShift send flow
• Changelly send flow