chore: add packaging directory skeleton + .gitignore build patterns

.gitignore

@@ -53,3 +53,12 @@ GITEA_API.md
 
 # Handoff drafts (operator scratch — final handoffs ARE committed)
 .claude/handoffs/*.draft.md
+
+# Build outputs (out-of-tree)
+build/
+
+# linuxdeploy + plugin caches (downloaded by scripts/lib/linuxdeploy.sh on first AppImage build)
+scripts/.cache/
+
+# Locally-produced AppImage artifacts
+*.AppImage

tests-impl/run-all.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# Run the full bats test suite for sethLabels packaging scripts.
+# Requires: bats (apt install bats).
+set -euo pipefail
+cd "$(dirname "$0")"
+exec bats *.bats