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-fetch.el --- Online definition fetcher 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:
+
+;; Network layer for `gloss'.  Walks a registry of online sources
+;; (`gloss-fetch--sources') in the order specified by the user-facing
+;; `gloss-fetch-sources' defcustom; aggregates per-source results into
+;; a single response shape.
+;;
+;; Public API:
+;;   `gloss-fetch-definitions' TERM
+;;     -> (:ok DEFS)                                ; any source returned >=1 def
+;;        | (:empty :no-defs (SYM ...) :failed (SYM ...))
+;;
+;; Each definition is a plist:
+;;   (:source SYM :text "Reference to ...")
+;;
+;; Per-source internal status taxonomy:
+;;   :ok :defs (...)   :no-defs   :unreachable   :server-error   :rate-limited
+;;
+;; libxml is treated as a precondition (probed once at first fetch);
+;; absent libxml disables online fetch package-wide for the session.
+;;
+;; See `docs/design/gloss.org' for the full design.
+
+;;; Code:
+
+;; Implementation pending.  Track via todo.org.
+
+(provide 'gloss-fetch)
+;;; gloss-fetch.el ends here