feat(net): add DNS client library with hostname resolution #86
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Implement DNS resolution capability for Breenix OS: - Add libs/libbreenix/src/dns.rs with full DNS protocol support - DNS header/response parsing per RFC 1035 - Hostname wire-format encoding (label length prefixed) - Compression pointer handling in responses - A record extraction with TTL - Error types: NXDOMAIN, Timeout, ParseError, etc. - Add userspace/tests/dns_test.rs test program - Resolve www.google.com via SLIRP DNS (10.0.2.3) - Resolve example.com as secondary domain - NXDOMAIN handling with strict error validation - Fix network routing for SLIRP mode - Always route through gateway MAC (SLIRP emulates all hosts) - Enables DNS queries to 10.0.2.3 - Add UDP ephemeral port allocation - bind(port=0) allocates from 49152-65535 range - Required for DNS to receive responses - Add 4 DNS boot stages (181 total, all passing) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
libs/libbreenix/src/dns.rs) with full DNS protocol supportChanges
libs/libbreenix/src/dns.rsuserspace/tests/dns_test.rskernel/src/net/mod.rskernel/src/socket/mod.rsxtask/src/main.rsTest plan
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