- Created src/dhcp.h: DHCP packet struct, lease info struct, message types,
options codes, client states, discover/receive/get_lease API
- Created src/dhcp.c: DHCP client with DISCOVER/OFFER/REQUEST/ACK flow,
manual IP+UDP header construction for broadcast, option parsing for
subnet mask/router/DNS/lease time/server ID, lease table, auto-applies
configuration to ethernet interface on ACK, sysfs /sys/dhcp/status
- Created apps/dhcp/dhcp.c: reads /sys/dhcp/status to display DHCP info
- Kernel calls dhcp_init() at boot
- Tested: clean boot, DHCP initialized, dhcp app in CPIO
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