fix: Move tree-sitter-pascal to optionalDependencies with pinned commit

Align with project convention: all tree-sitter grammars are optional.
Pin to commit 042119e for reproducible builds (npm v0.0.1 is outdated
and incompatible with Node.js v24 due to NAN bindings).

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

package-lock.json

@@ -15,8 +15,7 @@
         "commander": "^14.0.2",
         "figlet": "^1.8.0",
         "picomatch": "^4.0.3",
-        "tree-sitter": "0.22.4",
-        "tree-sitter-pascal": "github:Isopod/tree-sitter-pascal"
+        "tree-sitter": "0.22.4"
       },
       "bin": {
         "codegraph": "dist/bin/codegraph.js"
@@ -42,6 +41,7 @@
         "tree-sitter-java": "0.23.5",
         "tree-sitter-javascript": "0.23.1",
         "tree-sitter-kotlin": "0.3.8",
+        "tree-sitter-pascal": "github:Isopod/tree-sitter-pascal#042119eca2e18a60e56317fb06ee3ba5c32cb447",
         "tree-sitter-php": "0.23.11",
         "tree-sitter-python": "0.23.4",
         "tree-sitter-ruby": "0.23.1",
@@ -2587,6 +2587,7 @@
       "resolved": "git+ssh://git@github.com/Isopod/tree-sitter-pascal.git#042119eca2e18a60e56317fb06ee3ba5c32cb447",
       "hasInstallScript": true,
       "license": "MIT",
+      "optional": true,
       "dependencies": {
         "node-gyp-build": "^4.8.4"
       },