base: support modern terminals (ncurses-term + xterm-ghostty alias)

The base only shipped ncurses-base (xterm-256color, tmux), so SSHing in from
WezTerm/Alacritty/foot/Ghostty degraded to a dumb TERM fallback. Following the
maintainer's ansible common role:

- Dockerfile.base: install ncurses-term (terminfo for wezterm, alacritty,
  foot, st, base ghostty entry, and many more).
- rootfs/.../terminfo-src/ghostty.terminfo: thin xterm-ghostty alias
  (use=ghostty) — Ghostty connects as TERM=xterm-ghostty, which no distro
  packages. Compiled into the system db with 'tic -x'; build asserts it
  resolved via infocmp.
- kitty (xterm-kitty) already covered by kitty-terminfo; iTerm2 uses
  xterm-256color (ncurses-base).
- smoke-test: assert ncurses-term emulators + xterm-ghostty alias resolve.

Validated end-to-end in a throwaway container: ncurses-term brings the
entries, the alias compiles and equals the ghostty capability set. hadolint
clean, bash -n OK. Base-affecting, rebuilds base-<hash>. No tag.

Dockerfile.base

@@ -76,6 +76,13 @@ ENV DEBIAN_FRONTEND=noninteractive
 #                  true-colour from kitty over ssh; installing it makes
 #                  TERM=xterm-kitty understood. Pairs with the system-wide
 #                  Neovim termguicolors default (etc/xdg/nvim/sysinit.vim).
+#   ncurses-term   — broad terminfo bundle (wezterm, alacritty, foot, st, the
+#                  base `ghostty` entry, and many more) so SSHing in from a
+#                  modern emulator resolves its TERM instead of degrading to a
+#                  dumb fallback. xterm-kitty is NOT in it (hence kitty-terminfo
+#                  above); TERM=xterm-ghostty is compiled from an alias further
+#                  down (ncurses ships `ghostty`, not `xterm-ghostty`). iTerm2
+#                  defaults to xterm-256color (ncurses-base), so needs nothing.
 RUN apt-get update && \
     apt-get upgrade -y --no-install-recommends && \
     apt-get install -y --no-install-recommends \
@@ -114,6 +121,7 @@ RUN apt-get update && \
     socat \
     nano \
     kitty-terminfo \
+    ncurses-term \
     && ln -s /usr/bin/fdfind /usr/local/bin/fd \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
@@ -577,6 +585,16 @@ COPY rootfs/home/developer/.gitignore_global /etc/skel-devbox/.gitignore_global
 # of a muddy 256-colour fallback. Pairs with kitty-terminfo (installed above).
 COPY rootfs/etc/xdg/nvim/sysinit.vim /etc/xdg/nvim/sysinit.vim
 
+# ── Terminal support: xterm-ghostty terminfo alias ──────────────────
+# ncurses-term (installed above) covers wezterm/alacritty/foot/st and the base
+# `ghostty` entry, but Ghostty connects with TERM=xterm-ghostty, for which no
+# distro packages an entry. Ship a thin alias (use=ghostty) and compile it into
+# the system terminfo db with `tic -x`, so it inherits the maintained ghostty
+# capability set. The `infocmp` check fails the build if the entry didn't land.
+COPY rootfs/usr/local/share/terminfo-src/ghostty.terminfo /usr/local/share/terminfo-src/ghostty.terminfo
+RUN tic -x -o /usr/share/terminfo /usr/local/share/terminfo-src/ghostty.terminfo && \
+    infocmp -x xterm-ghostty >/dev/null
+
 # ── Entrypoint ────────────────────────────────────────────────────────
 COPY rootfs/usr/local/lib/pi-devbox/ /usr/local/lib/pi-devbox/
 # Image-baked skills + the global-AGENTS append snippet. Under /usr/local so a