fix: add cwd to prettier hook, consistent process.exit(0), and stdout pass-through

- post-edit-format.js: add cwd based on file directory so npx resolves
  correct local prettier binary
- post-edit-typecheck.js, post-edit-format.js: replace console.log(data)
  with process.stdout.write(data) to avoid trailing newline corruption
- Add process.exit(0) to 4 hooks for consistent termination
  (check-console-log, post-edit-console-warn, post-edit-format,
  post-edit-typecheck)
- run-all.js: switch from execSync to spawnSync so stderr is visible
  on the success path (hook warnings were silently discarded)
- Add 21 tests: cwd verification, process.exit(0) checks, exact
  stdout pass-through, extension edge cases, exclusion pattern
  matching, threshold boundary values (630 → 651)

scripts/hooks/post-edit-console-warn.js

@@ -49,4 +49,5 @@ process.stdin.on('end', () => {
   }
 
   process.stdout.write(data);
+  process.exit(0);
 });