Fix macOS 13 compatibility: mic detection fallback, Swift 6 concurren…

[meyermainnet]

Fixes macOS 13 compatibility…cy fixes, AppDelegate retention bug, MeetMatcher regex fix

[joncode]

Hey @meyermainnet — thanks for this! First outside PR on the project, and you found a real bug: the AppDelegate retention issue is a genuine catch. NSApplication.delegate is weak, our delegate's last use was the assignment, and ARC was free to release it early — it only worked by optimizer grace. I've landed that fix on main as c33e757 with Co-authored-by credit to you. Thank you!

On the macOS 13 portions, I have to flag some problems found while testing the branch:

The dlsym guard in AudioInputProbe unfortunately can't work. kAudioHardwarePropertyProcessObjectList and friends are C enum constants, not exported symbols — dlsym returns nil for them on every macOS version. You can verify with:

import Darwin
dlsym(dlopen(nil, RTLD_LAZY), "kAudioHardwarePropertyProcessObjectList") // nil, always

That makes list() return [] everywhere — I built the branch on macOS 26 and jumpcall status --verbose reports zero audio processes where main lists ~30. Net effect: Teams/Webex/FaceTime detection and the web-call fallback would silently turn off for all users (and as of v0.3.0, the Settings window's "Add Call App" flow too). The good news: since the constants are compile-time values, the whole runtime lookup is unnecessary — a plain if #available(macOS 14, *) guard at the top of list() is sufficient.

The regex conversions aren't needed for Ventura — Swift Regex literals are available from macOS 13 — and the NSRegularExpression version drops the anchoring: firstMatch accepts meeting URLs with trailing garbage (…/abc-defg-hijEXTRA) or embedded mid-string that wholeMatch rejects. Same for the concurrency rewrites: the branch builds fine at a 13 target with the untouched MainActor.assumeIsolated call sites elsewhere in the codebase, so those changes appear unneeded (happy to be corrected if you hit a concrete compile error on your machine — please share it!).

I'm genuinely open to macOS 13 support. The right-sized version is: the three deployment-target bumps + the #available(macOS 14, *) guard + a README note that mic-based detection is off on Ventura (Zoom, Meet tabs, and the window switcher all still work — a decent degraded mode). If you'd like to rebase this PR down to exactly that (note main has moved a lot — v0.3.0 and v0.4.0 landed since), I'd be glad to merge it. Otherwise no worries — I'll open a "help wanted" issue for it.

Thanks again for digging in — the delegate fix alone made this PR worth it. 🙏