chore: remove author attribution from TODO comments across multiple source files

Remove "(bob)" author prefix from all TODO comments in benchmark/method_call.wren, include/wren.h, src/main.c, src/wren_common.h, src/wren_compiler.c, src/wren_core.c, src/wren_value.c, src/wren_value.h, and src/wren_vm.c. Update the TODO_PATTERN regex in metrics script to match the new format without author parentheses. Also refactor test file counting in metrics to use os.walk with fnmatch for recursive directory traversal instead of glob.iglob.

metrics

@@ -1,10 +1,12 @@
 #!/usr/bin/python
 
 import glob
+import fnmatch
 import itertools
+import os
 import re
 
-TODO_PATTERN = re.compile(r'\s*// TODO\(')
+TODO_PATTERN = re.compile(r'\s*// TODO:')
 DOC_PATTERN = re.compile(r'\s*//')
 EXPECT_PATTERN = re.compile(r'// expect')
 
@@ -42,24 +44,25 @@ for source_path in files:
 
       num_code += 1
 
-for test_path in glob.iglob("test/*.wren"):
-  num_test_files += 1
-  with open(test_path, "r") as input:
-    for line in input:
-      if (line.strip() == ""):
-        num_test_empty += 1
-      else:
-        num_test += 1
+for dir_path, dir_names, file_names in os.walk("test"):
+  for file_name in fnmatch.filter(file_names, "*.wren"):
+    num_test_files += 1
+    with open(os.path.join(dir_path, file_name), "r") as input:
+      for line in input:
+        if (line.strip() == ""):
+          num_test_empty += 1
+        else:
+          num_test += 1
 
-      match = TODO_PATTERN.match(line)
-      if match:
-        num_test_todos += 1
-        continue
+        match = TODO_PATTERN.match(line)
+        if match:
+          num_test_todos += 1
+          continue
 
-      match = EXPECT_PATTERN.search(line)
-      if match:
-        num_expects += 1
-        continue
+        match = EXPECT_PATTERN.search(line)
+        if match:
+          num_expects += 1
+          continue
 
 print "source:"
 print "  files          ", num_files