More various fixes (F-*)

Merge pull request #94 from danielinux/rc1.0

Added CHANGELOG.md, preparing release.

Merge pull request #93 from danielinux/fixes_20260331

Fix regression in tcp_tx_desc_ip_len for non-ethernet devices

Fix handling of non-ethernet packets, pass desc as argument

DHCP fixes (copilot's review)

Fixed regressions and addressed copilot's comments

Switched to ghcr container 'wolfboot-ci' for m33mu tests

Guard ICMP RX state on fifo push failure

Guard UDP RX FIFO enqueue state

Guard SYN enqueue state transitions

tcp: keep closing sockets in CLOSING

Merge pull request #92 from danielinux/update-readme

Keep FIN_WAIT_2 on repeated close