clawbot 9ef0d35e81 resolver: remove DNS mocking, use real DNS queries in tests ...

Per review feedback: tests now make real DNS queries against
public DNS (google.com, cloudflare.com) instead of using a
mock DNS client. The DNSClient interface and mock infrastructure
have been removed.

- All 30 resolver tests hit real authoritative nameservers
- Tests verify actual iterative resolution works correctly
- Removed resolver_integration_test.go (merged into main tests)
- Context timeout increased to 60s for iterative resolution

2026-02-20 06:06:25 -08:00

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