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Pin to commit 042119e for reproducible builds (npm v0.0.1 is outdated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.json

@@ -38,8 +38,7 @@
     "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"
   },
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.0",
@@ -51,6 +50,7 @@
   },
   "optionalDependencies": {
     "@sengac/tree-sitter-dart": "1.1.6",
+    "tree-sitter-pascal": "github:Isopod/tree-sitter-pascal#042119eca2e18a60e56317fb06ee3ba5c32cb447",
     "sqlite-vss": "^0.1.2",
     "tree-sitter-c": "0.23.2",
     "tree-sitter-c-sharp": "0.23.1",