docs: LAN-access ssh-lan.conf + DEVBOX_LAN_AUTOJUMP_PRIVATE (inherited from base)

setup-lan-access.sh fixes (Include scope, ControlPath) + ssh-lan.conf and
RFC1918 autojump flow in via FROM base-pi-only. Documents the knob and new
host-owned config. Tag v0.78.0c AFTER opencode-devbox v1.15.13d publishes the
rebuilt base-pi-only, so it doesn't build on the stale base.

CHANGELOG.md

@@ -8,7 +8,21 @@ Tags follow the pi npm version: `v{pi_version}[letter]` — bare tag for the fir
 
 ## Unreleased
 
-_(no changes since v0.78.0b)_
+### Fixed / Added (inherited from the base via `FROM`)
+
+LAN-access improvements made in opencode-devbox's `setup-lan-access.sh` (baked
+into the `base-pi-only` image) flow through to pi-devbox automatically — no
+pi-devbox source change. Cut a fresh `base-pi-only` after the opencode-devbox
+release to pick them up:
+
+- **Fixed:** the generated `~/.ssh-local/config` had `Include ~/.ssh/config`
+  scoped to the `host`/`mac` block, so `dssh <peer>` by name was ignored.
+- **Fixed:** read-only `~/.ssh/cm` ControlPath broke multiplexed hosts
+  (`pmx-jh`, `proxmox*`, …); master sockets now use the writable sidecar.
+- **Added:** host-owned `~/.config/devbox-shell/ssh-lan.conf` for named-peer
+  `ProxyJump host` overrides (Included before `~/.ssh/config`).
+- **Added:** `DEVBOX_LAN_AUTOJUMP_PRIVATE=1` — ProxyJump any RFC1918 IP through
+  the host for roaming laptops.
 
 ## v0.78.0b — 2026-06-03