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/pty/native_pty.dart

@@ -1,8 +1,7 @@
-/// Native PTY via forkpty() — replaces the ptyc helper binary.
+/// Native PTY via forkpty().
 ///
 /// Uses Dart FFI to call forkpty() directly. The master fd stays
-/// in-process (no socketpair, no SCM_RIGHTS). The reader isolate
-/// uses poll() for clean shutdown.
+/// in-process. The reader isolate uses poll() for clean shutdown.
 ///
 /// Based on the pty-spike proof-of-concept. Platform-aware:
 ///   macOS: forkpty in libSystem (DynamicLibrary.process)
@@ -82,8 +81,6 @@ const _kWnohang = 1;
 // -- NativePty --------------------------------------------------------------
 
 /// A pseudo-terminal backed by forkpty() via Dart FFI.
-///
-/// Drop-in replacement for the old ptyc-based PtySession.
 class NativePty {
   final int _fd;
   final int pid;