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-core.el --- Data layer 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:
+
+;; Storage and lookup primitives for `gloss'.  Owns the in-memory
+;; cache (a hash table keyed by term) and the org file I/O.
+;;
+;; Public API:
+;;   `gloss-core-lookup' TERM            -> entry plist or nil
+;;   `gloss-core-save' TERM BODY SOURCE  -> entry plist (saved)
+;;   `gloss-core-list'                   -> (TERM ...)
+;;   `gloss-core-find-buffer-position' TERM -> marker
+;;
+;; Entry plist shape:
+;;   (:term "anaphora"
+;;    :body "Reference to..."
+;;    :source wiktionary
+;;    :added "2026-04-28"
+;;    :marker #<marker at N in gloss.org>)
+;;
+;; See `docs/design/gloss.org' for the full design.
+
+;;; Code:
+
+;; Implementation pending.  Track via todo.org.
+
+(provide 'gloss-core)
+;;; gloss-core.el ends here