Merge branch 'main' into claude/windows-arm64-shim

Previously the node_modules/.bin shim executable was hardcoded to build
for x86_64+nehalem even when building bun for Windows ARM64. This meant
every binary in node_modules/.bin ran under x64 emulation.

The shim source (bun_shim_impl.zig) has no arch-specific code -- it uses
only NTDLL/kernel32 APIs and std.os.windows.teb() which already has a
native aarch64 implementation. The resulting ARM64 binary is 12.5KB.

build.zig

@@ -98,7 +98,7 @@ const BunBuildOptions = struct {
 
     pub fn windowsShim(this: *BunBuildOptions, b: *Build) WindowsShim {
         return this.windows_shim orelse {
-            this.windows_shim = WindowsShim.create(b);
+            this.windows_shim = WindowsShim.create(b, this.arch);
             return this.windows_shim.?;
         };
     }
@@ -759,7 +759,6 @@ fn configureObj(b: *Build, opts: *BunBuildOptions, obj: *Compile) void {
 
     obj.no_link_obj = opts.os != .windows and !opts.no_llvm;
 
-
     if (opts.enable_asan and !enableFastBuild(b)) {
         if (@hasField(Build.Module, "sanitize_address")) {
             if (opts.enable_fuzzilli) {
@@ -986,10 +985,16 @@ const WindowsShim = struct {
     exe: *Compile,
     dbg: *Compile,
 
-    fn create(b: *Build) WindowsShim {
+    fn create(b: *Build, arch: Arch) WindowsShim {
         const target = b.resolveTargetQuery(.{
-            .cpu_model = .{ .explicit = &std.Target.x86.cpu.nehalem },
-            .cpu_arch = .x86_64,
+            .cpu_model = switch (arch) {
+                .aarch64 => .baseline,
+                else => .{ .explicit = &std.Target.x86.cpu.nehalem },
+            },
+            .cpu_arch = switch (arch) {
+                .aarch64 => .aarch64,
+                else => .x86_64,
+            },
             .os_tag = .windows,
             .os_version_min = getOSVersionMin(.windows),
         });

docs/bundler/executables.mdx

@@ -228,16 +228,16 @@ To build for macOS x64:
 
 The order of the `--target` flag does not matter, as long as they're delimited by a `-`.
 
-| --target              | Operating System | Architecture | Modern | Baseline | Libc  |
-| --------------------- | ---------------- | ------------ | ------ | -------- | ----- |
-| bun-linux-x64         | Linux            | x64          | ✅     | ✅       | glibc |
-| bun-linux-arm64       | Linux            | arm64        | ✅     | N/A      | glibc |
-| bun-windows-x64       | Windows          | x64          | ✅     | ✅       | -     |
-| bun-windows-arm64     | Windows          | arm64        | ✅     | N/A      | -     |
-| bun-darwin-x64        | macOS            | x64          | ✅     | ✅       | -     |
-| bun-darwin-arm64      | macOS            | arm64        | ✅     | N/A      | -     |
-| bun-linux-x64-musl    | Linux            | x64          | ✅     | ✅       | musl  |
-| bun-linux-arm64-musl  | Linux            | arm64        | ✅     | N/A      | musl  |
+| --target             | Operating System | Architecture | Modern | Baseline | Libc  |
+| -------------------- | ---------------- | ------------ | ------ | -------- | ----- |
+| bun-linux-x64        | Linux            | x64          | ✅     | ✅       | glibc |
+| bun-linux-arm64      | Linux            | arm64        | ✅     | N/A      | glibc |
+| bun-windows-x64      | Windows          | x64          | ✅     | ✅       | -     |
+| bun-windows-arm64    | Windows          | arm64        | ✅     | N/A      | -     |
+| bun-darwin-x64       | macOS            | x64          | ✅     | ✅       | -     |
+| bun-darwin-arm64     | macOS            | arm64        | ✅     | N/A      | -     |
+| bun-linux-x64-musl   | Linux            | x64          | ✅     | ✅       | musl  |
+| bun-linux-arm64-musl | Linux            | arm64        | ✅     | N/A      | musl  |
 
 <Warning>
   On x64 platforms, Bun uses SIMD optimizations which require a modern CPU supporting AVX2 instructions. The `-baseline`