feat: plugin skeleton for Shopware 6.6 and 6.7 with CI and release pipeline

- composer.json (MIT, shopware/core ~6.6.0 || ~6.7.0, PHP ^8.2), plugin class, placeholder icon
- PR checks and release workflow taken over from AeonDumpManager; phpunit runs as a 6.6/6.7 matrix
- CHANGELOG, LICENSE, README, CLAUDE.md, smoke test

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/ci/assert-built-assets.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Assert that a packaged extension zip contains the built admin/storefront JS when the sources exist.
+# Usage: scripts/ci/assert-built-assets.sh <zip>   (run from the repo root; BusyBox-safe: uses unzip -l)
+set -euo pipefail
+ZIP="${1:?usage: assert-built-assets.sh <zip>}"
+LIST=$(unzip -l "$ZIP")
+
+check() { # <label> <entry-glob-prefix> <expected path in zip>
+  local label="$1" entry="$2" expected="$3"
+  if [ -f "${entry}/main.js" ] || [ -f "${entry}/main.ts" ]; then
+    echo "$LIST" | grep -q "$expected" || { echo "::error::${label} entry exists but the zip has no built ${label} JS (${expected})"; exit 1; }
+    echo "ok: ${label} JS is in the zip"
+  fi
+}
+
+check admin src/Resources/app/administration/src "Resources/public/administration/assets/"
+check storefront src/Resources/app/storefront/src "Resources/app/storefront/dist/"

scripts/protect-main.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# One-time (re-runnable) setup: require the PR checks on `main` using the Gitea `tea` CLI.
+# `tea branches protect` cannot set status-check contexts, hence `tea api`.
+# Usage: scripts/protect-main.sh [owner/repo]   (default: derived from the git remote)
+set -euo pipefail
+
+REPO="${1:-$(git config --get remote.origin.url | sed -E 's#^.*[:/]([^/]+/[^/]+)$#\1#; s#\.git$##')}"
+
+tea api -X PATCH "repos/${REPO}/branch_protections/main" -d '{
+  "enable_status_check": true,
+  "status_check_contexts": [
+    "plugin-checks / version-changelog (pull_request)",
+    "plugin-checks / package (pull_request)",
+    "plugin-checks / phpunit (6.6) (pull_request)",
+    "plugin-checks / phpunit (6.7) (pull_request)"
+  ]
+}'