fix: use readFile utility in hooks and add pattern type safety

- Replace raw fs.readFileSync with readFile() from utils in
  check-console-log.js and post-edit-console-warn.js to eliminate
  TOCTOU race conditions (file deleted between existsSync and read)
- Remove redundant existsSync in post-edit-format.js (exec already
  handles missing files via its catch block)
- Resolve path upfront in post-edit-typecheck.js before tsconfig walk
- Add type guard in getGitModifiedFiles() to skip non-string and
  empty patterns before regex compilation

scripts/lib/utils.js

@@ -366,6 +366,7 @@ function getGitModifiedFiles(patterns = []) {
     // Pre-compile patterns, skipping invalid ones
     const compiled = [];
     for (const pattern of patterns) {
+      if (typeof pattern !== 'string' || pattern.length === 0) continue;
       try {
         compiled.push(new RegExp(pattern));
       } catch {