macOS Apple Silicon: Anki 26.09 (and 26.08.1 / 25.02.7) hang on launch — no window, stub sleeps at ~32 KB RSS

Mac Mini M4, macOS recent, Apple Silicon. Anki 26.09-mac-apple.dmg (216 MB / ~651 MB installed), also tried 26.08.1-mac-apple and 25.02.7-mac-apple-qt6.

Symptom: Dock icon bounces or does nothing. No window. Terminal: /Applications/Anki.app/Contents/MacOS/Anki hangs until killed. Process stays at ~32 KB RSS, 0.00 CPU. lsappinfo find bundleid=net.ankiweb.dtop → empty System Events does not list an Anki GUI process.

Already tried:

• xattr -cr /Applications/Anki.app
• Right-click Open
• spctl --master-disable + Privacy & Security “Anywhere”
• Removed ~/Library/Application Support/AnkiProgramFiles
• Fresh ANKI_BASE=/tmp/anki-test (still hangs)
• QT_DEBUG_PLUGINS=1 (no plugin output)
• gldriver6=software (25.02.7)
• codesign --verify: valid; spctl: accepted, Notarized Developer ID
• Bundle is complete (Python.framework, Resources/app, aqt-26.9)
• Framework Python is a dylib only (no bin/python3); running it gives exec format error
• Homebrew python3.13 + PYTHONPATH to app + app_packages: aqt.run() also hangs and ignores Ctrl-C (needed kill -9)

26.09 Contents/MacOS contains only the small arm64 stub “Anki”. iPhone Anki works. Collection not the cause (clean ANKI_BASE failed too).