feat: Intel Mac (x86_64) and macOS Ventura support

[crichalchemist]

Summary

Adds support for running Zentty on Intel Macs (x86_64) with macOS 13 Ventura.

Zentty currently builds and runs only on Apple Silicon with macOS 14+. This contribution extends that to the previous generation of hardware and the macOS release it shipped with.

Changes

Build system

• Lower deployment target to macOS 13.0; add x86_64 to ARCHS for universal binary output
• Vendor FuzzyMatch source locally (Swift package manager resolution fails at Swift 5.9)
• Downgrade sentry-cocoa to 8.37.0 (8.38+ requires macOS 14)
• Patch ghostty pixel_format import for macOS 13 compilation

GhosttyKit bootstrap

• Add MacPorts prefix search to scripts/build_ghosttykit.sh alongside Homebrew
• Allow Zig 0.16.x fallback when 0.14.x is unavailable via MacPorts

Swift compatibility

• Shim MainActor.assumeIsolated for macOS 13 (available macOS 14+)
• Backport Swift 6 features (borrowing, consuming) used in the codebase
• Wrap macOS 14 APIs (NSWindow.collectionBehavior additions, NSVisualEffectView options) behind #available(macOS 14.0, *)

CI / developer tooling

• Add GitHub Actions build matrix: arm64/macOS 15 + x86_64/macOS 13
• Add a pre-commit hook that runs xcodebuild build (with CODE_SIGNING_ALLOWED=NO) to catch compilation errors before push
• Set CLAUDE.md as the single source of truth for agent instructions; AGENTS.md and GEMINI.md symlink to it

Assets & tests

• Wire assets/icon.png into AppIcon.appiconset so the app bundle ships with an icon
• Fix test_chrome_geometry_derives_clip_safe_pane_border_inset_and_rounds_outward_on_retina: on macOS < 26, outerWindowRadius = 10 and shellInset + paneInset = 12 cause paneRadius to clamp to 0; assert the correct 0.0/0.5 values on pre-Tahoe behind #available(macOS 26.0, *)

Test plan

• scripts/build_ghosttykit.sh completes on both arm64/macOS 15 and x86_64/macOS 13
• xcodebuild build -scheme Zentty ... CODE_SIGNING_ALLOWED=NO succeeds on both targets
• ZenttyLogicTests pass on macOS 13 (verified locally on Intel MacBook Pro)
• GitHub Actions matrix passes on both runners

CLA

I have read CLA.md and agree to its terms.

[dedene]

Thanks a lot for taking the time to dig into this! 🙏 The Ventura compatibility work is useful, but I don’t want to merge this PR in its current shape.

A couple of important distinctions:

• Zentty already builds universal Release binaries with both arm64 and x86_64 slices. The missing piece is macOS 13/Ventura support, not Intel support by itself.
• Supporting Zentty running on Ventura is different from supporting Zentty being developed on Ventura. I understand the Swift 5.9 downgrade may be needed for local builds on Ventura/Xcode 15, but I’m not ready to make that the project’s build baseline.

Could you maybe rework this as a smaller runtime-support PR? Or shall I rework on the essentials for what is needed to make Zentty run on Ventura?

What I’d like to see:

• keep the project on Swift 6
• lower the deployment target only where needed
• add the required macOS 13 availability guards
• remove Vendor/FuzzyMatch entirely (I don't want the full dependency source in this repo history for what appears to be a Package.swift compatibility patch. A fork/tag or upstream PR is a better fit)
• use a patched FuzzyMatch fork/tag or upstream fix instead of vendoring the source
• leave AGENTS.md / CLAUDE.md out of this change
• keep unrelated changes like hooks and app icon work out of the PR

I’m open to Ventura runtime support, but I want that change to stay narrow and reviewable.

[crichalchemist]

Closing this in favour of a narrower, cleaner PR that addresses your feedback.

The new PR is #35 — it cherry-picks only the commits directly related to macOS 13 runtime support:

• Lower deployment target to 13.0 (no ARCHS override — universal builds are already correct upstream)
• Swift 6 remains unchanged
• FuzzyMatch stays on the SPM ordo-one/FuzzyMatch reference — no vendoring
• Excludes: Swift 5.9 downgrade, AGENTS.md/CLAUDE.md, AppIcon, hooks, CI changes

Thanks for the detailed review!