Update CLAUDE.md: mark woocommerce as read-only, note docker not yet available

Add constraints section documenting that the woocommerce plugin is read-only
and that the Docker environment is not yet set up. Track composer.lock.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

composer.lock

@@ -0,0 +1,20 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "fc5a36240bb371bdf7ede8d903510047",
+    "packages": [],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": {},
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=8.3"
+    },
+    "platform-dev": {},
+    "plugin-api-version": "2.6.0"
+}