Exclude pracht typegen outputs from oxfmt

pracht typegen --check requires generated files to byte-match the
emitter's output (quoted keys, single-line types) while oxfmt --check
requires prettier-style formatting — the two can never both hold, and
the formatter rewriting the generated file is what caused the original
committed drift. Generated files are not formatter-governed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: JoviDeCroock

.oxfmtrc.json

@@ -1,4 +1,11 @@
 {
   "$schema": "./node_modules/oxfmt/configuration_schema.json",
-  "ignorePatterns": ["**/*.md", "**/package.json", "**/LICENSE"]
+  "ignorePatterns": [
+    "**/*.md",
+    "**/package.json",
+    "**/LICENSE",
+    "**/pracht.d.ts",
+    "**/pracht-routes.ts",
+    "**/pracht-capabilities.d.ts"
+  ]
 }