Add Liquid template language support for Shopify themes

- Add 'liquid' to Language type and default include patterns
- Create LiquidExtractor with regex-based extraction (tree-sitter-liquid has ABI issues)
- Extract render/include/section references as component nodes
- Extract schema blocks as constant nodes with parsed names
- Extract assign statements as variable nodes
- Create file relationship edges for snippet/section references

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@colbymchenry/codegraph",
-  "version": "0.1.9",
+  "version": "0.2.6",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@colbymchenry/codegraph",
-      "version": "0.1.9",
+      "version": "0.2.6",
       "license": "MIT",
       "dependencies": {
         "@xenova/transformers": "^2.17.0",
@@ -22,6 +22,7 @@
         "tree-sitter-java": "^0.23.5",
         "tree-sitter-javascript": "^0.23.1",
         "tree-sitter-kotlin": "^0.3.8",
+        "tree-sitter-liquid": "github:hankthetank27/tree-sitter-liquid",
         "tree-sitter-php": "^0.23.11",
         "tree-sitter-python": "^0.23.6",
         "tree-sitter-ruby": "^0.23.1",
@@ -2431,6 +2432,24 @@
       "integrity": "sha512-5m3bsyrjFWE1xf7nz7YXdN4udnVtXK6/Yfgn5qnahL6bCkf2yKt4k3nuTKAtT4r3IG8JNR2ncsIMdZuAzJjHQQ==",
       "license": "MIT"
     },
+    "node_modules/tree-sitter-liquid": {
+      "version": "0.1.0",
+      "resolved": "git+ssh://git@github.com/hankthetank27/tree-sitter-liquid.git#d6ebde3974742cd1b61b55d1d94aab1dacb41056",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "node-addon-api": "^8.0.0",
+        "node-gyp-build": "^4.8.1"
+      },
+      "peerDependencies": {
+        "tree-sitter": "^0.21.1"
+      },
+      "peerDependenciesMeta": {
+        "tree_sitter": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/tree-sitter-php": {
       "version": "0.23.12",
       "resolved": "https://registry.npmjs.org/tree-sitter-php/-/tree-sitter-php-0.23.12.tgz",