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;

vendor/libghostty-spm/Patches/arm64e/zig-objc/0001-arm64e-boundaries.patch

@@ -0,0 +1,64 @@
+diff --git a/src/block.zig b/src/block.zig
+index bd4b17d..4d43262 100644
+--- a/src/block.zig
++++ b/src/block.zig
+@@ -4,6 +4,7 @@ const assert = std.debug.assert;
+ const Allocator = std.mem.Allocator;
+ const objc = @import("main.zig");
+ 
++extern "c" fn ghostty_arm64e_prepare_block(*anyopaque) void;
+ // We have to use the raw C allocator for all heap allocation in here
+ // because the objc runtime expects `malloc` to be used. If you don't use
+ // malloc you'll get segfaults because the objc runtime will try to free
+@@ -42,7 +43,7 @@ pub fn Block(
+         const Self = @This();
+         const captures_info = @typeInfo(Captures).@"struct";
+         const InvokeFn = FnType(anyopaque);
+-        const descriptor: Descriptor = .{
++        var descriptor: Descriptor = .{
+             .reserved = 0,
+             .size = @sizeOf(Context),
+             .copy_helper = &descCopyHelper,
+@@ -90,6 +91,7 @@ pub fn Block(
+                 @field(ctx, field.name) = @field(captures, field.name);
+             }
+ 
++            ghostty_arm64e_prepare_block(@ptrCast(&ctx));
+             return ctx;
+         }
+ 
+diff --git a/src/class.zig b/src/class.zig
+index e0c989c..697fe31 100644
+--- a/src/class.zig
++++ b/src/class.zig
+@@ -7,5 +7,7 @@ const objc = @import("main.zig");
+ const MsgSend = @import("msg_send.zig").MsgSend;
+ 
++extern "c" fn ghostty_arm64e_sign_function(*const anyopaque) *const anyopaque;
++
+ pub const Class = struct {
+     value: c.Class,
+ 
+@@ -65,7 +67,12 @@ pub const Class = struct {
+         assert(fn_info.params.len >= 2);
+         assert(fn_info.params[0].type == c.id);
+         assert(fn_info.params[1].type == c.SEL);
+-        _ = c.class_replaceMethod(self.value, objc.sel(name).value, @ptrCast(&imp), null);
++        _ = c.class_replaceMethod(
++            self.value,
++            objc.sel(name).value,
++            @ptrCast(@alignCast(ghostty_arm64e_sign_function(@ptrCast(&imp)))),
++            null,
++        );
+     }
+ 
+     // allows adding new methods; returns true on success.
+@@ -81,7 +88,7 @@ pub const Class = struct {
+         return boolResult(c.class_addMethod(
+             self.value,
+             objc.sel(name).value,
+-            @ptrCast(&imp),
++            @ptrCast(@alignCast(ghostty_arm64e_sign_function(@ptrCast(&imp)))),
+             &encoding,
+         ));
+     }