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.

CHANGELOG.md

@@ -33,6 +33,19 @@ Pre-v1.0.0 tags followed the pi npm version (`v{pi_version}[letter]`).
   overridden per-user (`:set notermguicolors`, or your own init). Base-affecting
   (`Dockerfile.base` apt package + COPY), rebuilds `base-<hash>`.
 
+- **Terminal support beyond kitty: `ncurses-term` + a compiled `xterm-ghostty`
+  alias.** The base previously shipped only `ncurses-base` (xterm-256color,
+  tmux), so SSHing in from a modern emulator degraded to a dumb fallback. The
+  base now installs `ncurses-term` (terminfo for WezTerm, Alacritty, foot, st,
+  and the base `ghostty` entry, among many others) and compiles an
+  `xterm-ghostty` alias with `tic -x` (`use=ghostty`) — Ghostty connects as
+  `TERM=xterm-ghostty` and no distro packages that name. Combined with
+  `kitty-terminfo` (xterm-kitty) and xterm-256color (iTerm2's default, already
+  in ncurses-base), the common modern terminals now resolve their TERM. The
+  approach mirrors the maintainer's ansible `common` role. Base-affecting
+  (`Dockerfile.base` apt + COPY + `tic` RUN, plus a new
+  `rootfs/usr/local/share/terminfo-src/ghostty.terminfo`), rebuilds `base-<hash>`.
+
 - **Repository hygiene: `LICENSE`, `THIRD_PARTY.md`, and `.dockerignore`.** The
   repo declared MIT only in prose; it now ships an actual `LICENSE` file (MIT,
   © Joakim Persson) plus `THIRD_PARTY.md` recording that the published images