feat: add package/build.sh cross-platform build script

- build.sh supports linux/amd64, linux/arm64, darwin/amd64, darwin/arm64,
  windows/amd64, and 'all' for matrix build
- Components: homed (CGO, Linux/macOS-only), waiter (all platforms), gui
- Platform matrix documented in script header
- waiter: extract setRawMode into rawmode_linux.go + rawmode_other.go for
  cross-platform support
- Add cmd/gui/node_modules/ and dist/ to .gitignore
- Fix .gitignore waiter pattern to not ignore cmd/waiter/ directory

cmd/waiter/main.go

@@ -11,7 +11,6 @@ import (
 	"strings"
 	"syscall"
 	"time"
-	"unsafe"
 )
 
 const (
@@ -238,34 +237,5 @@ func printServerOutput(content string) {
 	}
 }
 
-func setRawMode(fd int) (func(), error) {
-	type termios struct {
-		Iflag  uint32
-		Oflag  uint32
-		Cflag  uint32
-		Lflag  uint32
-		Cc     [20]byte
-		Ispeed uint32
-		Ospeed uint32
-	}
-	const (
-		TCGETS = 0x5401
-		TCSETS = 0x5402
-		ICANON = 0x2
-		ECHO   = 0x8
-	)
-	var old termios
-	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), TCGETS, uintptr(unsafe.Pointer(&old))); err != 0 {
-		return func() {}, fmt.Errorf("ioctl TCGETS: %v", err)
-	}
-	new := old
-	new.Lflag &^= ICANON | ECHO
-	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), TCSETS, uintptr(unsafe.Pointer(&new))); err != 0 {
-		return func() {}, fmt.Errorf("ioctl TCSETS: %v", err)
-	}
-	return func() {
-		syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), TCSETS, uintptr(unsafe.Pointer(&old)))
-	}, nil
-}
 
 

cmd/waiter/rawmode_defs.go

@@ -0,0 +1,18 @@
+package main
+
+type termios struct {
+	Iflag  uint32
+	Oflag  uint32
+	Cflag  uint32
+	Lflag  uint32
+	Cc     [20]byte
+	Ispeed uint32
+	Ospeed uint32
+}
+
+const (
+	TCGETS = 0x5401
+	TCSETS = 0x5402
+	ICANON = 0x2
+	ECHO   = 0x8
+)

cmd/waiter/rawmode_linux.go

@@ -0,0 +1,23 @@
+//go:build linux
+
+package main
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func setRawMode(fd int) (func(), error) {
+	var old termios
+	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), TCGETS, uintptr(unsafe.Pointer(&old))); err != 0 {
+		return func() {}, err
+	}
+	new := old
+	new.Lflag &^= ICANON | ECHO
+	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), TCSETS, uintptr(unsafe.Pointer(&new))); err != 0 {
+		return func() {}, err
+	}
+	return func() {
+		syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), TCSETS, uintptr(unsafe.Pointer(&old)))
+	}, nil
+}

cmd/waiter/rawmode_other.go

@@ -0,0 +1,9 @@
+//go:build !linux
+
+package main
+
+import "fmt"
+
+func setRawMode(fd int) (func(), error) {
+	return func() {}, fmt.Errorf("raw terminal mode not supported on this platform")
+}