Ignore compiled test binaries

The v3 tester executables were accidentally committed. Ignore all
test binaries built by tests/Makefile, CMakeLists.txt and meson.build
so they can't be re-added by mistake.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

diff --git a/.gitignore b/.gitignore
index 3646747..20ef663 100644
--- a/.gitignore
+++ b/.gitignore
@@ -70,9 +70,20 @@
 *.app
 
 loader_example
+# Compiled test binaries (built by tests/Makefile, CMakeLists.txt, meson.build)
 tests/tester
 tests/tester_noexcept
+tests/tester_customjson
 tests/tester_intensive_customjson
+tests/tester_v3
+tests/tester_v3_c
+tests/tester_v3_c_cpp
+tests/tester_v3_c_v1port
+tests/tester_v3_c_v1port_cpp
+tests/tester_v3_freestanding
+tests/tester_v3_json_c
+tests/fuzzer/fuzz_gltf
+tests/fuzzer/fuzz_gltf_customjson
 tests/issue-97.gltf
 tests/issue-261.gltf
 tests/issue-495-external.gltf