refactor(lint): use Python built-in json module for validation

Replaced external check-json hook with custom validator using Python's
built-in json module (json.load). Created validate_json.py wrapper to
handle multiple files.

Benefits:
- No external dependencies
- Uses Python's standard library json parser
- Same validation logic as the build system
- Fast and reliable (0.16s for all JSON files)

.pre-commit-config.yaml

@@ -78,17 +78,16 @@ repos:
   # PHASE 2: BASIC VALIDATORS (Structure and syntax)
   # =============================================================================
 
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v5.0.0
-    hooks:
-      # --- JSON Validation ---
-      - id: check-json
-        name: "Validate JSON files"
-        files: \.json$
-        description: "Validate all JSON files have correct syntax"
-
   - repo: local
     hooks:
+      # --- JSON Validation ---
+      - id: validate-json
+        name: "Validate JSON files"
+        entry: python tools/scripts/utilities/validate_json.py
+        language: python
+        files: \.json$
+        pass_filenames: true
+        description: "Validate all JSON files have correct syntax using Python's built-in json module"
       # --- Project Structure Check ---
       - id: check-project-structure
         name: "Check required project files exist"