feat: add packaging metadata + initial changelog

packaging/appimage-recipe.env

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+# linuxdeploy / linuxdeploy-plugin-qt configuration — sourced by scripts/build-appimages.sh.
+# Documents the bundling choices for both AppImages.
+#
+# Spec: sethlabels-docs/specs/2026-04-29-packaging-design.md §5.3
+
+# Qt platform plugins to include (linuxdeploy-plugin-qt picks these up automatically;
+# documenting here for posterity).
+QT_PLATFORM_PLUGINS="xcb"
+
+# Image format plugins. The GUI app needs SVG/PNG support; batch CLI does not.
+QT_IMAGE_FORMAT_PLUGINS_GUI="svg"
+QT_IMAGE_FORMAT_PLUGINS_BATCH=""
+
+# Files in the AppDir we don't want bundled (linuxdeploy is greedy by default).
+APPDIR_EXCLUDE_GLOBS=()

packaging/changelog.md

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+# sethLabels packaging changelog
+
+Per-release packaging notes. Each entry covers what changed in the *packaging*,
+not what changed upstream. For application-level changes, see the upstream
+`docs/CHANGELOG.md` and `git log upstream/master`.
+
+## Format
+
+```
+## <version>  —  <ISO date>
+
+- bullet describing what changed in this packaging release
+- ...
+```
+
+`<version>` is `<upstream-tag>-seth<N>` (e.g., `3.99-master618-seth1`), matching
+the git tag and the artifact filename. See spec §D4.
+
+---
+
+## (unreleased)
+
+- First end-to-end release dry run pending.

packaging/deb-metadata.env

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+# CPack DEB metadata overrides — sourced by scripts/build-deb.sh.
+# All values are passed to cpack as -D CPACK_DEBIAN_PACKAGE_<KEY>="$VALUE".
+#
+# Spec: sethlabels-docs/specs/2026-04-29-packaging-design.md §5.2
+
+MAINTAINER="Seth Freiberg <seth@sethfreiberg.com>"
+SECTION="graphics"
+HOMEPAGE="https://glabels.org"
+# CPACK_PACKAGE_NAME override — required because upstream sets
+# CPACK_PACKAGE_NAME=glabels (CMakeLists.txt:86) and decision D6 wants glabels-qt.
+PACKAGE_NAME="glabels-qt"