Add the macOS client spike and record its SwiftUI gap results

TODO.md

@@ -16,8 +16,6 @@
 
 # M8 — macOS client
 
-- macOS client spike
-  See `docs/macos.md`. SwiftUI package under `mac/` built with `swift build` and bundled by script, pointed at a development byre (never the service). Settle each row of "Gaps in SwiftUI": composer Enter/Shift-Enter/IME, image paste and drop, a long real transcript scrolling and staying stuck to the bottom, cross-message selection, SwiftTerm terminal with Ctrl keys, Core Text loading `web/fonts/`, SVG images. Record which fallbacks were needed.
 - macOS client store and API
   Generated client from `api/openapi.yaml`, hand-written SSE client, `Store` and `Feed` ported from `state.ts`, startup sequence, connection screen with 401/403/TLS/unreachable errors and Change Server…, `Palette.swift` generated from `web/style.css`.
 - macOS client panes and transcript
@@ -27,4 +25,4 @@
 - macOS client overlays, menus and notifications
   Switcher, keyboard help, alert and confirm overlays, Merge and Discard dialogs, Go menu shortcuts with the Ctrl variants and terminal passthrough, UNUserNotificationCenter notifications.
 - macOS client parity review
-  Side by side with the web client on the same server, window size and appearance, using disposable tasks: every tab, switcher, Inbox choice types, merge/discard dialogs, light/dark, narrow windows, IME. Document build, install and storage in `docs/operations.md`.
+  Side by side with the web client on the same server, window size and appearance, using disposable tasks: every tab, switcher, Inbox choice types, merge/discard dialogs, light/dark, narrow windows. Document build, install and storage in `docs/operations.md`.