chore: scaffold gloss package

Five layered files per the design at docs/design/gloss.org. gloss-core for the data layer, gloss-fetch for the network layer, gloss-display for the UI, gloss-drill for the spaced-repetition export, and gloss.el as the entry point. All five are skeletons. Implementation comes next.

The Makefile delegates to ert with the usual unit, integration, and per-file targets. It also runs paren and lint passes. The package is licensed GPL-3.0-or-later. README is a placeholder pointing at the design doc.

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+;;; gloss-display.el --- Side-buffer UI for gloss -*- lexical-binding: t -*-
+
+;; Copyright (C) 2026 Craig Jennings
+;; Author: Craig Jennings <c@cjennings.net>
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+;;; Commentary:
+
+;; UI layer for `gloss'.  Defines the side buffer's major mode and
+;; renders entries; also owns the picker shown when an online fetch
+;; returns multiple candidate definitions.
+;;
+;; Public API:
+;;   `gloss-display-show-entry' TERM BODY
+;;   `gloss-display-pick-definition' TERM DEFINITIONS -> chosen plist
+;;
+;; Pure helper (full N/B/E test coverage):
+;;   `gloss-display--format-candidate' PLIST -> "[source] text..."
+;;
+;; `gloss-mode' is derived from `special-mode': `q' quits the window.
+;;
+;; See `docs/design/gloss.org' for the full design.
+
+;;; Code:
+
+;; Implementation pending.  Track via todo.org.
+
+(provide 'gloss-display)
+;;; gloss-display.el ends here