remove dissolved daemon, retire ptyc, fix golden cross-platform

Complete three overdue cleanups discovered during macOS health check:

D-56 daemon dissolution: delete bin/clide.dart, DaemonServer,
and orphaned tests (test/cli/, subprocess_test, in_process_test).
Update stale "clide --daemon" references in i18n catalogs, error
messages, editor_commands, CI scripts, and decision records.

ptyc retirement: delete ptyc/ source tree, PtySession, scm_rights.
Remove from Toolchain resolution, ToolCheck gate, backend
serialization, testmode harness, Makefile, CI, and sandbox
entitlements. PTY spawning uses NativePty (Dart FFI forkpty) since
the terminal was absorbed in-tree. D-5 amended.

Golden tests: wire the existing but never-applied clideGoldenConfig
via flutter_test_config.dart. Disable CI goldens (Skia anti-aliasing
differs between macOS/Linux even with Ahem). Keep platform-keyed
goldens only — goldens/linux/ and goldens/macos/ each run on their
own OS.

Test suite: 826 pass, 0 fail on macOS (was 829 pass, 11 fail).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/src/panes/pane.dart

@@ -2,8 +2,8 @@
 /// travels cleanly into the Flutter app (which can't depend on
 /// `dart:ffi`-using code for the web build).
 ///
-/// The daemon's [PaneRegistry] keeps a parallel `PtySession` keyed on
-/// [id] and mutates [isClosed] when the session exits.
+/// [PaneRegistry] keeps a parallel [NativePty] keyed on [id] and
+/// mutates [isClosed] when the session exits.
 library;
 
 /// Kind of a pane. Keep this enum small and explicit — each kind