[Bug] CLI: No address validation — invalid input cast to Address

[realproject7]

Bug

claim command casts opts.address directly to Address type without validation. agent register does the same with opts.wallet. Invalid addresses produce confusing RPC errors instead of a clear CLI error.

Fix:

• Validate with viem isAddress() before casting
• Show clear error: "Invalid address: "

Affected files:

• packages/cli/src/commands/claim.ts
• packages/cli/src/commands/agent-register.ts

Rules for T3:

1. NEVER store keys/secrets in plain text files without .gitignore protection
2. NEVER hardcode addresses, keys, or sensitive values
3. Communicate via AgentChattr MCP chat by tagging agents (@t1, @T2A, @t2b). Your terminal is NOT visible to other agents.

Checklist:

• isAddress() validation before all Address casts
• Clear error messages for invalid input
• npm run lint and npm run typecheck pass