Support ENS name resolution in address parameters

[0xtus]

Description

Allow tools that accept addresses to also accept ENS names (e.g., vitalik.eth).

Current behavior

Address parameters accept:

• Ethereum addresses (0x1234...)
• Participant names from the trust registry ("WeatherOracle")
• Self-reference ("me")
• Index reference ("#1", "#2")

Proposed behavior

Also accept ENS names like vitalik.eth, resolving them via the ENS registry on L1.

Suggested approach

1. Detect .eth suffix in the address resolver (src/utils/)
2. Use viem's getEnsAddress to resolve
3. Cache resolutions to avoid repeated lookups
4. Fall through to existing resolution if ENS fails