macos: fix CI tests, build.py runtime/codesign, and gitignore

Tests (main_test.py, osr_test.py):
Chrome 130+ registers MachPortRendezvousServer via bootstrap_check_in,
which requires a pre-declared launchd service.  Without an app bundle
CFBundleIdentifier is empty, so the service name becomes
".MachPortRendezvousServer.<pid>", bootstrap_check_in returns
BOOTSTRAP_UNKNOWN_SERVICE, and every spawned renderer subprocess
crashes on startup.  Adding --in-process-renderer makes the renderer
run as a thread in the browser process — MachPortRendezvousClient is
never called, bypassing the Mach rendezvous path entirely.  The
data-URI test pages do not need a working network service.

build.py:
- Add LINUX/MAC platform constants (previously only WINDOWS existed).
- Fix CEF runtime detection: was Linux-only (checked for libcef.so,
  globbed cef*_linux64); add elif MAC branch that checks for
  "Chromium Embedded Framework.framework" and globs cef*_mac*.
- Fix _copy_cef_runtime: use copytree(symlinks=True) so .framework
  symlinks (e.g. Headers -> Versions/A/Headers) are preserved instead
  of being dereferenced and duplicated.
- Add _codesign_macos(): ad-hoc signs subprocess and cefpython_py*.so
  after each dev build; the CEF framework is left untouched since it
  already carries the CEF project's signature.

.gitignore:
Add cefpython3/chrome_crashpad_handler and
cefpython3/Chromium Embedded Framework.framework/ — both are copied
from cef*_macarm64/bin/ by _copy_cef_runtime and were previously
unignored on macOS dev builds.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: linesight

.gitignore

@@ -1,35 +1,37 @@
-.idea/
-build/
-dist/
-cefpython3/*.pyd
-cefpython3/*.dll
-cefpython3/*.exe
-cefpython3/*.so
-cefpython3/*.so.*
-cefpython3/subprocess
-cefpython3/*.pak
-cefpython3/*.dat
-cefpython3/*.bin
-cefpython3/*.json
-cefpython3/locales/
-_cmake_test/
-_skbuild/
-venv/
-*.log
-__pycache__/
-*.pyc
-cefclient
-webcache/
-examples/screenshot.png
-examples/pyinstaller/build/
-examples/pyinstaller/dist/
-examples/GPUCache/
-examples/blob_storage/
-examples/webrtc_event_logs/
-unittests/GPUCache/
-unittests/blob_storage/
-unittests/webrtc_event_logs/
-.DS_Store
-MediaDeviceSalts
-MediaDeviceSalts-journal
-.claude/
+.idea/
+build/
+dist/
+cefpython3/*.pyd
+cefpython3/*.dll
+cefpython3/*.exe
+cefpython3/*.so
+cefpython3/*.so.*
+cefpython3/subprocess
+cefpython3/chrome_crashpad_handler
+cefpython3/Chromium Embedded Framework.framework/
+cefpython3/*.pak
+cefpython3/*.dat
+cefpython3/*.bin
+cefpython3/*.json
+cefpython3/locales/
+_cmake_test/
+_skbuild/
+venv/
+*.log
+__pycache__/
+*.pyc
+cefclient
+webcache/
+examples/screenshot.png
+examples/pyinstaller/build/
+examples/pyinstaller/dist/
+examples/GPUCache/
+examples/blob_storage/
+examples/webrtc_event_logs/
+unittests/GPUCache/
+unittests/blob_storage/
+unittests/webrtc_event_logs/
+.DS_Store
+MediaDeviceSalts
+MediaDeviceSalts-journal
+.claude/