fix: apply clang-format to all source files

Fixes formatting violations that were causing CI failures.
Applied clang-format-14 to ensure consistent code formatting
across the codebase.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

test/testing.h

@@ -23,7 +23,9 @@ namespace test {
 
 // StatusIs is a matcher that matches a status that has the same code and
 // message as the expected status.
-MATCHER_P(StatusIs, status, "") { return arg.code() == status; }
+MATCHER_P(StatusIs, status, "") {
+  return arg.code() == status;
+}
 
 // Support for testing absl::StatusOr.
 template <typename T>
@@ -40,7 +42,9 @@ template <typename T>
   return ::testing::AssertionSuccess();
 }
 
-MATCHER_P(IsOkAndHolds, value, "") { return IsOkAndHolds(arg, value); }
+MATCHER_P(IsOkAndHolds, value, "") {
+  return IsOkAndHolds(arg, value);
+}
 
 // Helper to test if a StatusOr contains an error with a specific message
 MATCHER_P(StatusIsWithMessage, message, "") {