Add Windows native watcher with Unix socket IPC

Architecture:
- Windows binary: watches files via ReadDirectoryChangesW (fsnotify),
  sends events as newline-delimited JSON over Unix domain socket
- Container: performs initial sync, then listens on socket for events
  from Windows watcher

New files:
- cmd_windows.go: Windows serve command (watcher + socket server)
- cmd_linux.go: Linux socket client + event listener
- types.go: shared FileEvent, FileMeta, Manifest types
- watcher_test_helper.go: inotify-based watcher for integration tests

Changes:
- main.go: simplified to just call run()
- watcher.go: removed fsnotify dependency, extracted Watcher interface
- sync.go: removed duplicate type definitions
- watcher_test.go: uses watchForTests() helper

Usage:
  sourcewatch.exe -dir C:\myproject -socket D:\sourcewatch.sock
  docker run -v D:\sourcewatch.sock:/run/sourcewatch.sock \
             -v C:\myproject:/host:ro -v mydata:/data sourcewatch

8 files changed, 575 insertions, 211 deletions

diff --git a/cmd_linux.go b/cmd_linux.go
new file mode 100644
index 0000000..9e7e237
--- /dev/null
+++ b/cmd_linux.go
@@ -0,0 +1,131 @@
+//go:build !windows
+
+package main
+
+import (
+	"bufio"
+	"context"
+	"encoding/json"
+	"flag"
+	"net"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+)
+
+var (
+	hostDir     = flag.String("host", "/host", "Host source directory (read-only)")
+	dataDir     = flag.String("data", "/data", "Data destination directory")
+	verbose     = flag.Bool("verbose", false, "Enable verbose logging (shorthand for -log-level debug)")
+	logLevel    = flag.String("log-level", "info", "Log level: debug, info, warn, error, none")
+	dryRun      = flag.Bool("dry-run", false, "Preview what would be synced without copying")
+	socketPath  = flag.String("socket", "", "Unix socket to receive events from (Windows watcher)")
+)
+
+func run() {
+	flag.Parse()
+
+	if *verbose {
+		*logLevel = "debug"
+	}
+
+	level, err := ParseLogLevel(*logLevel)
+	if err != nil {
+		logErrorf("%v", err)
+		os.Exit(1)
+	}
+	SetLogLevel(level)
+
+	stack := NewGitignoreStack(*hostDir)
+
+	manifest, err := initialSync(*hostDir, *dataDir, stack, *dryRun)
+	if err != nil {
+		logErrorf("initial sync failed: %v", err)
+		os.Exit(1)
+	}
+
+	if *dryRun {
+		logInfo("dry-run complete, exiting")
+		return
+	}
+
+	if *socketPath == "" {
+		logInfo("no -socket specified, running in standalone mode (no file watching)")
+		ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+		defer cancel()
+		<-ctx.Done()
+		return
+	}
+
+	logInfo("watcher: connecting to %s ...", *socketPath)
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
+	if err := listenSocket(ctx, *socketPath, manifest, stack); err != nil {
+		logErrorf("socket listener failed: %v", err)
+		os.Exit(1)
+	}
+}
+
+func listenSocket(ctx context.Context, socketPath string, manifest *Manifest, stack *GitignoreStack) error {
+	var conn net.Conn
+	var err error
+
+	for {
+		if ctx.Err() != nil {
+			return ctx.Err()
+		}
+		conn, err = net.Dial("unix", socketPath)
+		if err == nil {
+			break
+		}
+		logDebug("connect failed: %v, retrying...", err)
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-time.After(1 * time.Second):
+		}
+	}
+	defer conn.Close()
+
+	logInfo("watcher: connected, monitoring for changes ...")
+
+	scanner := bufio.NewScanner(conn)
+	for scanner.Scan() {
+		var evt FileEvent
+		if err := json.Unmarshal(scanner.Bytes(), &evt); err != nil {
+			logDebug("bad event: %v", err)
+			continue
+		}
+
+		logDebug("event: %s %s", evt.Op, evt.Path)
+
+		if isGitDir(evt.Path) {
+			continue
+		}
+
+		if stack.IsIgnored(evt.Path) {
+			continue
+		}
+
+		destPath := filepath.Join(*dataDir, evt.Path)
+		srcPath := filepath.Join(*hostDir, evt.Path)
+
+		switch evt.Op {
+		case "create":
+			syncCreate(srcPath, destPath, evt.Path, manifest, stack, *dryRun, nil)
+		case "write":
+			syncWrite(srcPath, destPath, evt.Path, manifest, *dryRun)
+		case "remove":
+			syncRemove(destPath, evt.Path, manifest, *dryRun)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/cmd_windows.go b/cmd_windows.go
new file mode 100644
index 0000000..b68851a
--- /dev/null
+++ b/cmd_windows.go
@@ -0,0 +1,250 @@
+//go:build windows
+
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"net"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/fsnotify/fsnotify"
+)
+
+var (
+	socketPath = flag.String("socket", "", "Unix socket path to serve events on (required)")
+	sourceDir  = flag.String("dir", "", "Source directory to watch (required)")
+)
+
+func run() {
+	flag.Parse()
+
+	if *socketPath == "" || *sourceDir == "" {
+		fmt.Fprintln(os.Stderr, "Usage: sourcewatch.exe -dir <source> -socket <socket-path>")
+		os.Exit(1)
+	}
+
+	level, err := ParseLogLevel(*logLevel)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	SetLogLevel(level)
+
+	logInfo("watcher: starting on %s", *sourceDir)
+	logInfo("watcher: serving on %s", *socketPath)
+
+	stack := NewGitignoreStack(*sourceDir)
+
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		logErrorf("watcher: %v", err)
+		os.Exit(1)
+	}
+	defer watcher.Close()
+
+	if err := addWatchersRecursively(watcher, *sourceDir, stack); err != nil {
+		logErrorf("watcher: %v", err)
+		os.Exit(1)
+	}
+
+	os.Remove(*socketPath)
+
+	ln, err := net.Listen("unix", *socketPath)
+	if err != nil {
+		logErrorf("socket: %v", err)
+		os.Exit(1)
+	}
+	defer func() {
+		ln.Close()
+		os.Remove(*socketPath)
+	}()
+
+	var mu sync.Mutex
+	debounceTimers := make(map[string]*time.Timer)
+	debounceOps := make(map[string]fsnotify.Op)
+
+	clients := make(map[net.Conn]bool)
+	var clientsMu sync.Mutex
+
+	go func() {
+		for {
+			conn, err := ln.Accept()
+			if err != nil {
+				return
+			}
+			clientsMu.Lock()
+			clients[conn] = true
+			clientsMu.Unlock()
+			logDebug("client connected: %s", conn.RemoteAddr())
+
+			go func(c net.Conn) {
+				defer func() {
+					clientsMu.Lock()
+					delete(clients, c)
+					clientsMu.Unlock()
+					c.Close()
+				}()
+				buf := make([]byte, 1)
+				for {
+					if _, err := c.Read(buf); err != nil {
+						return
+					}
+				}
+			}(conn)
+		}
+	}()
+
+	broadcast := func(evt FileEvent) {
+		data, err := json.Marshal(evt)
+		if err != nil {
+			return
+		}
+		data = append(data, '\n')
+
+		clientsMu.Lock()
+		defer clientsMu.Unlock()
+		for c := range clients {
+			if _, err := c.Write(data); err != nil {
+				go func() {
+					clientsMu.Lock()
+					delete(clients, c)
+					clientsMu.Unlock()
+					c.Close()
+				}()
+			}
+		}
+	}
+
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
+	go func() {
+		<-ctx.Done()
+		ln.Close()
+	}()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+
+		case event, ok := <-watcher.Events:
+			if !ok {
+				return
+			}
+
+			relPath, err := filepath.Rel(*sourceDir, event.Name)
+			if err != nil {
+				continue
+			}
+
+			if isGitDir(relPath) {
+				continue
+			}
+
+			if stack.IsIgnored(relPath) {
+				continue
+			}
+
+			logDebug("event: %s %s", event.Op, relPath)
+
+			if event.Op&fsnotify.Create != 0 {
+				srcPath := filepath.Join(*sourceDir, relPath)
+				info, err := os.Lstat(srcPath)
+				if err == nil && info.IsDir() {
+					if hasGitignore(srcPath) {
+						stack.Push(srcPath)
+					}
+					if err := watcher.Add(srcPath); err != nil {
+						logErrorf("watch %s: %v", relPath, err)
+					}
+					filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
+						if err != nil || !info.IsDir() || path == srcPath {
+							return nil
+						}
+						watcher.Add(path)
+						return nil
+					})
+				}
+			}
+
+			mu.Lock()
+			if existing, exists := debounceOps[relPath]; exists {
+				debounceTimers[relPath].Stop()
+				debounceOps[relPath] = existing | event.Op
+			} else {
+				debounceOps[relPath] = event.Op
+			}
+			path := relPath
+			debounceTimers[relPath] = time.AfterFunc(200*time.Millisecond, func() {
+				mu.Lock()
+				op := debounceOps[path]
+				delete(debounceOps, path)
+				delete(debounceTimers, path)
+				mu.Unlock()
+
+				evt := FileEvent{Path: path}
+				switch {
+				case op&fsnotify.Create != 0:
+					evt.Op = "create"
+				case op&fsnotify.Write != 0:
+					evt.Op = "write"
+				case op&fsnotify.Remove != 0:
+					evt.Op = "remove"
+				case op&fsnotify.Rename != 0:
+					evt.Op = "remove"
+				default:
+					return
+				}
+
+				broadcast(evt)
+			})
+			mu.Unlock()
+
+		case err, ok := <-watcher.Errors:
+			if !ok {
+				return
+			}
+			logErrorf("watcher: %v", err)
+		}
+	}
+}
+
+func addWatchersRecursively(watcher *fsnotify.Watcher, root string, stack *GitignoreStack) error {
+	return filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		relPath, err := filepath.Rel(root, path)
+		if err != nil {
+			return err
+		}
+
+		if isGitDir(relPath) {
+			if info.IsDir() {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+
+		if info.IsDir() {
+			if hasGitignore(path) {
+				stack.Push(path)
+			}
+			if !stack.IsIgnored(relPath) {
+				return watcher.Add(path)
+			}
+		}
+
+		return nil
+	})
+}
diff --git a/main.go b/main.go
index 570890d..ffee7e4 100644
--- a/main.go
+++ b/main.go
@@ -1,58 +1,5 @@
 package main
 
-import (
-	"context"
-	"flag"
-	"log"
-	"os"
-	"os/signal"
-	"syscall"
-)
-
-var (
-	hostDir  = flag.String("host", "/host", "Host source directory (read-only)")
-	dataDir  = flag.String("data", "/data", "Data destination directory")
-	verbose  = flag.Bool("verbose", false, "Enable verbose logging (shorthand for -log-level debug)")
-	logLevel = flag.String("log-level", "info", "Log level: debug, info, warn, error, none")
-	dryRun   = flag.Bool("dry-run", false, "Preview what would be synced without copying")
-)
-
 func main() {
-	flag.Parse()
-
-	if *verbose {
-		*logLevel = "debug"
-	}
-
-	level, err := ParseLogLevel(*logLevel)
-	if err != nil {
-		log.Fatal(err)
-	}
-	SetLogLevel(level)
-
-	log.SetFlags(0)
-	log.SetOutput(nil)
-
-	stack := NewGitignoreStack(*hostDir)
-
-	manifest, err := initialSync(*hostDir, *dataDir, stack, *dryRun)
-	if err != nil {
-		logErrorf("initial sync failed: %v", err)
-		os.Exit(1)
-	}
-
-	if *dryRun {
-		logInfo("dry-run complete, exiting")
-		return
-	}
-
-	logInfo("watcher: ready, monitoring for changes ...")
-
-	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
-	defer cancel()
-
-	if err := watch(ctx, *hostDir, *dataDir, manifest, stack, *dryRun); err != nil {
-		logErrorf("watcher failed: %v", err)
-		os.Exit(1)
-	}
+	run()
 }
diff --git a/sync.go b/sync.go
index 806b7a0..78f3fa8 100644
--- a/sync.go
+++ b/sync.go
@@ -8,17 +8,6 @@ import (
 	"time"
 )
 
-type FileMeta struct {
-	Size    int64
-	Mode    os.FileMode
-	ModTime time.Time
-	Symlink string
-}
-
-type Manifest struct {
-	Files map[string]FileMeta
-}
-
 type syncStats struct {
 	files   int
 	dirs    int
diff --git a/types.go b/types.go
new file mode 100644
index 0000000..69d7702
--- /dev/null
+++ b/types.go
@@ -0,0 +1,23 @@
+package main
+
+import (
+	"os"
+	"time"
+)
+
+type FileEvent struct {
+	Op   string `json:"op"`
+	Path string `json:"path"`
+	New  string `json:"new_path,omitempty"`
+}
+
+type FileMeta struct {
+	Size    int64
+	Mode    os.FileMode
+	ModTime time.Time
+	Symlink string
+}
+
+type Manifest struct {
+	Files map[string]FileMeta
+}
diff --git a/watcher.go b/watcher.go
index 14cc584..1ee3972 100644
--- a/watcher.go
+++ b/watcher.go
@@ -1,102 +1,11 @@
 package main
 
 import (
-	"context"
 	"os"
 	"path/filepath"
-	"sync"
-	"time"
-
-	"github.com/fsnotify/fsnotify"
 )
 
-func watch(ctx context.Context, hostDir, dataDir string, manifest *Manifest, stack *GitignoreStack, dryRun bool) error {
-	watcher, err := fsnotify.NewWatcher()
-	if err != nil {
-		return err
-	}
-	defer watcher.Close()
-
-	var mu sync.Mutex
-	debounceTimers := make(map[string]*time.Timer)
-	debounceOps := make(map[string]fsnotify.Op)
-
-	if err := addWatchersRecursively(watcher, hostDir, stack); err != nil {
-		return err
-	}
-
-	for {
-		select {
-		case <-ctx.Done():
-			return nil
-
-		case event, ok := <-watcher.Events:
-			if !ok {
-				return nil
-			}
-
-			relPath, err := filepath.Rel(hostDir, event.Name)
-			if err != nil {
-				continue
-			}
-
-			if isGitDir(relPath) {
-				continue
-			}
-
-			if stack.IsIgnored(relPath) {
-				continue
-			}
-
-			logDebug("event: %s %s", event.Op, relPath)
-
-			mu.Lock()
-			if existing, exists := debounceOps[relPath]; exists {
-				debounceTimers[relPath].Stop()
-				debounceOps[relPath] = existing | event.Op
-			} else {
-				debounceOps[relPath] = event.Op
-			}
-			path := relPath
-			debounceTimers[relPath] = time.AfterFunc(200*time.Millisecond, func() {
-				mu.Lock()
-				op := debounceOps[path]
-				delete(debounceOps, path)
-				delete(debounceTimers, path)
-				mu.Unlock()
-				handleEvent(op, hostDir, dataDir, path, manifest, stack, dryRun, watcher)
-			})
-			mu.Unlock()
-
-		case err, ok := <-watcher.Errors:
-			if !ok {
-				return nil
-			}
-			logErrorf("watcher: %v", err)
-		}
-	}
-}
-
-func handleEvent(op fsnotify.Op, hostDir, dataDir, relPath string, manifest *Manifest, stack *GitignoreStack, dryRun bool, watcher *fsnotify.Watcher) {
-	destPath := filepath.Join(dataDir, relPath)
-	srcPath := filepath.Join(hostDir, relPath)
-
-	switch {
-	case op&fsnotify.Create != 0:
-		syncCreate(srcPath, destPath, relPath, manifest, stack, dryRun, watcher)
-
-	case op&fsnotify.Write != 0:
-		syncWrite(srcPath, destPath, relPath, manifest, dryRun)
-
-	case op&fsnotify.Remove != 0:
-		syncRemove(destPath, relPath, manifest, dryRun)
-
-	case op&fsnotify.Rename != 0:
-		syncRemove(destPath, relPath, manifest, dryRun)
-	}
-}
-
-func syncCreate(srcPath, destPath, relPath string, manifest *Manifest, stack *GitignoreStack, dryRun bool, watcher *fsnotify.Watcher) {
+func syncCreate(srcPath, destPath, relPath string, manifest *Manifest, stack *GitignoreStack, dryRun bool, watcher Watcher) {
 	info, err := os.Lstat(srcPath)
 	if err != nil {
 		if os.IsNotExist(err) {
@@ -110,16 +19,16 @@ func syncCreate(srcPath, destPath, relPath string, manifest *Manifest, stack *Gi
 		if hasGitignore(srcPath) {
 			stack.Push(srcPath)
 		}
-		if err := watcher.Add(srcPath); err != nil {
-			logErrorf("watch %s: %v", relPath, err)
-		}
-		filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
-			if err != nil || !info.IsDir() || path == srcPath {
+		if watcher != nil {
+			watcher.Add(srcPath)
+			filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
+				if err != nil || !info.IsDir() || path == srcPath {
+					return nil
+				}
+				watcher.Add(path)
 				return nil
-			}
-			watcher.Add(path)
-			return nil
-		})
+			})
+		}
 		if dryRun {
 			logInfo("[dry-run] would create dir: %s", relPath)
 			return
@@ -238,33 +147,6 @@ func syncRemove(destPath, relPath string, manifest *Manifest, dryRun bool) {
 	}
 }
 
-func addWatchersRecursively(watcher *fsnotify.Watcher, root string, stack *GitignoreStack) error {
-	return filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return err
-		}
-
-		relPath, err := filepath.Rel(root, path)
-		if err != nil {
-			return err
-		}
-
-		if isGitDir(relPath) {
-			if info.IsDir() {
-				return filepath.SkipDir
-			}
-			return nil
-		}
-
-		if info.IsDir() {
-			if hasGitignore(path) {
-				stack.Push(path)
-			}
-			if !stack.IsIgnored(relPath) {
-				return watcher.Add(path)
-			}
-		}
-
-		return nil
-	})
+type Watcher interface {
+	Add(path string) error
 }
diff --git a/watcher_test.go b/watcher_test.go
index df16930..56f9697 100644
--- a/watcher_test.go
+++ b/watcher_test.go
@@ -20,7 +20,7 @@ func TestWatcher_Create(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -42,7 +42,7 @@ func TestWatcher_CreateInSubdir(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -66,7 +66,7 @@ func TestWatcher_Write(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -90,7 +90,7 @@ func TestWatcher_Remove(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -114,7 +114,7 @@ func TestWatcher_Rename(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -139,7 +139,7 @@ func TestWatcher_IgnoredFileEvents(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -167,7 +167,7 @@ func TestWatcher_Debouncing(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -199,7 +199,7 @@ func TestWatcher_CreateDirectory(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -229,7 +229,7 @@ func TestWatcher_RemoveDirectory(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -255,7 +255,7 @@ func TestWatcher_VerifyManifestUpdated(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -282,7 +282,7 @@ func TestWatcher_NestedGitignore_CreateIgnored(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -310,7 +310,7 @@ func TestWatcher_NestedGitignore_CreateUnignore(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -332,7 +332,7 @@ func TestWatcher_CreateSymlink(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -382,7 +382,7 @@ func TestWatcher_UpdateSymlinkTarget(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -421,7 +421,7 @@ func TestWatcher_RemoveSymlink(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
@@ -447,7 +447,7 @@ func TestWatcher_ModifySymlinkTargetFile(t *testing.T) {
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	go watch(ctx, host, data, manifest, stack, false)
+	go watchForTests(ctx, host, data, manifest, stack, false)
 
 	time.Sleep(100 * time.Millisecond)
 
diff --git a/watcher_test_helper.go b/watcher_test_helper.go
new file mode 100644
index 0000000..519d3f6
--- /dev/null
+++ b/watcher_test_helper.go
@@ -0,0 +1,142 @@
+//go:build !windows
+
+package main
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+
+	"github.com/fsnotify/fsnotify"
+)
+
+// watchForTests uses inotify directly for integration testing.
+// This is only used in tests - production uses socket-based events from Windows watcher.
+func watchForTests(ctx context.Context, hostDir, dataDir string, manifest *Manifest, stack *GitignoreStack, dryRun bool) error {
+	watcher, err := fsnotify.NewWatcher()
+	if err != nil {
+		return err
+	}
+	defer watcher.Close()
+
+	var mu sync.Mutex
+	debounceTimers := make(map[string]*time.Timer)
+	debounceOps := make(map[string]fsnotify.Op)
+
+	if err := addWatchersForTests(watcher, hostDir, stack); err != nil {
+		return err
+	}
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+
+		case event, ok := <-watcher.Events:
+			if !ok {
+				return nil
+			}
+
+			relPath, err := filepath.Rel(hostDir, event.Name)
+			if err != nil {
+				continue
+			}
+
+			if isGitDir(relPath) {
+				continue
+			}
+
+			if stack.IsIgnored(relPath) {
+				continue
+			}
+
+			if event.Op&fsnotify.Create != 0 {
+				srcPath := filepath.Join(hostDir, relPath)
+				info, err := os.Lstat(srcPath)
+				if err == nil && info.IsDir() {
+					if hasGitignore(srcPath) {
+						stack.Push(srcPath)
+					}
+					watcher.Add(srcPath)
+					filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
+						if err != nil || !info.IsDir() || path == srcPath {
+							return nil
+						}
+						watcher.Add(path)
+						return nil
+					})
+				}
+			}
+
+			mu.Lock()
+			if existing, exists := debounceOps[relPath]; exists {
+				debounceTimers[relPath].Stop()
+				debounceOps[relPath] = existing | event.Op
+			} else {
+				debounceOps[relPath] = event.Op
+			}
+			path := relPath
+			debounceTimers[relPath] = time.AfterFunc(200*time.Millisecond, func() {
+				mu.Lock()
+				op := debounceOps[path]
+				delete(debounceOps, path)
+				delete(debounceTimers, path)
+				mu.Unlock()
+
+				destPath := filepath.Join(dataDir, path)
+				srcPath := filepath.Join(hostDir, path)
+
+				switch {
+				case op&fsnotify.Create != 0:
+					syncCreate(srcPath, destPath, path, manifest, stack, dryRun, watcher)
+				case op&fsnotify.Write != 0:
+					syncWrite(srcPath, destPath, path, manifest, dryRun)
+				case op&fsnotify.Remove != 0:
+					syncRemove(destPath, path, manifest, dryRun)
+				case op&fsnotify.Rename != 0:
+					syncRemove(destPath, path, manifest, dryRun)
+				}
+			})
+			mu.Unlock()
+
+		case err, ok := <-watcher.Errors:
+			if !ok {
+				return nil
+			}
+			_ = err
+		}
+	}
+}
+
+func addWatchersForTests(watcher *fsnotify.Watcher, root string, stack *GitignoreStack) error {
+	return filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		relPath, err := filepath.Rel(root, path)
+		if err != nil {
+			return err
+		}
+
+		if isGitDir(relPath) {
+			if info.IsDir() {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+
+		if info.IsDir() {
+			if hasGitignore(path) {
+				stack.Push(path)
+			}
+			if !stack.IsIgnored(relPath) {
+				return watcher.Add(path)
+			}
+		}
+
+		return nil
+	})
+}