初始提交：terminalX 可运行态（M0/M1/M1.5 已真机验证）

- M0: libghostty SSH 终端（渲染/输入/连接）+ 白屏修复(OutputGate) + 会话状态机/自动重连
- M1: tsnet 用户态组网 + SSH-over-tsnet(fd 桥)，shell 级真机验证；R5(Go+gvisor+C+++Swift 同进程) retire
- M1.5: tmux -CC 原生 tab（MVP）
- 结构: packages/(TXCore·TXTransport), apps/TerminalX, vendor/(libghostty-spm/libssh2/mbedtls/tsnet-bridge), artifacts/
- 文档: CLAUDE.md + docs/HANDOFF.md（新会话入口）
- 环境: 认证代理→依赖 vendor 本地化；Go 在 ~/.local/go；仅模拟器/未签名
- 待续: M2 mosh, tmux 多 pane, M4 安全(host key/SE)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

vendor/libghostty-spm/Patches/arm64e/ghostty/0001-arm64e-boundaries.patch

@@ -0,0 +1,47 @@
+diff --git a/build.zig.zon b/build.zig.zon
+index f80cd53b3..e6141add7 100644
+--- a/build.zig.zon
++++ b/build.zig.zon
+@@ -26,10 +26,7 @@
+             .lazy = true,
+         },
+         .zig_objc = .{
+-            // mitchellh/zig-objc
+-            .url = "https://deps.files.ghostty.org/zig_objc-f356ed02833f0f1b8e84d50bed9e807bf7cdc0ae.tar.gz",
+-            .hash = "zig_objc-0.0.0-Ir_Sp5gTAQCvxxR7oVIrPXxXwsfKgVP7_wqoOQrZjFeK",
+-            .lazy = true,
++            .path = ".libghostty-spm/zig_objc",
+         },
+         .zig_js = .{
+             // mitchellh/zig-js
+diff --git a/pkg/macos/video/display_link.zig b/pkg/macos/video/display_link.zig
+index 4866531f2..18e9e40ec 100644
+--- a/pkg/macos/video/display_link.zig
++++ b/pkg/macos/video/display_link.zig
+@@ -2,6 +2,8 @@ const std = @import("std");
+ const assert = std.debug.assert;
+ const Allocator = std.mem.Allocator;
+ const c = @import("c.zig").c;
++extern "c" fn ghostty_arm64e_sign_function(*const anyopaque) *const anyopaque;
++
+ 
+ pub const DisplayLink = opaque {
+     pub const Error = error{
+@@ -58,7 +60,7 @@ pub const DisplayLink = opaque {
+     ) Error!void {
+         if (c.CVDisplayLinkSetOutputCallback(
+             @ptrCast(self),
+-            @ptrCast(&(struct {
++            @ptrCast(@alignCast(ghostty_arm64e_sign_function(@ptrCast(&(struct {
+                 fn callback(
+                     displayLink: *DisplayLink,
+                     inNow: *const c.CVTimeStamp,
+@@ -78,7 +80,7 @@ pub const DisplayLink = opaque {
+                     );
+                     return c.kCVReturnSuccess;
+                 }
+-            }).callback),
++            }).callback)))),
+             userinfo,
+         ) != c.kCVReturnSuccess)
+             return error.InvalidOperation;