[oddessentials]

Refs #7. This adds a native macOS build alongside the Windows one, plus two fixes that testing on a real Mac turned up.

Fixes found on a Mac

• Agents got no replies. Release builds buffer piped stdout on macOS, so the MCP server's replies only arrived when the agent disconnected. Godot's run/flush_stdout_on_print is now on.
• Exporting without replacing ran folder names through a shell. OS.execute runs its command through a shell on macOS, so a destination folder named like $(touch x) ran that command. ln is now started directly with OS.execute_with_pipe, keeping the atomic no-overwrite behaviour. New tests cover hostile folder names and eight racing publishes: exactly one wins and nothing is left behind. Windows is unchanged.

Mac support

• Cmd shortcuts on a Mac (undo, redo, save), with Mac tooltips. Ctrl is unchanged elsewhere.
• Mac wording: Trash, Show in Finder, Terminal. The connect dialog's commands are quoted for zsh.
• A macOS export preset: universal, with the ETC2/ASTC texture import Apple Silicon needs.
• tools/package.ps1 (was package_windows.ps1) takes -Platform macOS. The kits and licence go in Contents/Resources, the app is ad-hoc signed again and verified, and it's zipped with ditto.
• CI adds a build-macos job that tests, packages, checks the signature and smoke-tests the app. Releases now attach AgentGuildBuilders-macos.zip too.
• The README and the agent page cover installing on a Mac and opening an unsigned app the first time.
• A second commit tracks tests/site_commands.gd.uid, which was missed in Agent-ready docs page on GitHub Pages: download, install and run Builders #10/Agent-ready setup page on GitHub Pages #11.

Tested on an M4 Mac mini (macOS 27)

• All five suites pass:

  Suite	Result
  run	1,190 passed
  hardening	130 passed
  clearance_hardening	58 passed
  package_hardening	164 passed
  site_commands	9 of 9 match

• The packaged ZIP passes codesign --verify --deep --strict and launches with its kits. The MCP smoke test passes 10 of 10 both headless and in a window.

• The agent page's Mac install block works for both installing and updating.

Not yet verified

• Hands-on input: Cmd+Z, Cmd+Shift+Z and Cmd+S, the Trash menu and the native file panels haven't been tried by hand. Shortcuts are covered by tests, and synthetic input was blocked by macOS permissions.
• Retina scaling: untested. The test display is 1080p, and scaling is left unchanged.
• Windows: this PR's CI is the first time the Windows build runs these changes. Locally, package.ps1 still produces the same Windows ZIP layout.
• Export time: a final-quality export took about 14 minutes on the Mac, and an MCP client with a 10-minute limit gave up waiting. Export speed is unchanged here.

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