fix(ci): address Windows test failures and timeout

- Extract inode function to platform-specific files (inode_unix.go,
  inode_windows.go) to fix syscall.Stat_t compile error on Windows
- Add skipOnWindows helper and skip Unix permission/symlink tests
  on Windows where chmod semantics differ
- Increase Windows test timeout from 10m to 20m since full test
  suite runs slower without race detector

Fixes Windows CI failures introduced when PR #904 expanded Windows
testing from smoke tests to full test suite.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/storage/sqlite/freshness_test.go

@@ -6,7 +6,6 @@ import (
 	"os"
 	"path/filepath"
 	"sync"
-	"syscall"
 	"testing"
 	"time"
 
@@ -15,20 +14,6 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 )
 
-// getInode returns the inode of a file (Unix only)
-func getInode(path string) uint64 {
-	info, err := os.Stat(path)
-	if err != nil {
-		return 0
-	}
-	if sys := info.Sys(); sys != nil {
-		if stat, ok := sys.(*syscall.Stat_t); ok {
-			return stat.Ino
-		}
-	}
-	return 0
-}
-
 // testFreshnessEnv creates two independent connections to the same database file.
 // conn1 simulates the daemon's long-lived connection.
 // conn2 simulates an external process (like git merge bringing in new data).

internal/storage/sqlite/inode_unix.go

@@ -0,0 +1,23 @@
+//go:build !windows
+
+package sqlite
+
+import (
+	"os"
+	"syscall"
+)
+
+// getInode returns the inode of a file (Unix only).
+// Used for debugging file replacement detection in tests.
+func getInode(path string) uint64 {
+	info, err := os.Stat(path)
+	if err != nil {
+		return 0
+	}
+	if sys := info.Sys(); sys != nil {
+		if stat, ok := sys.(*syscall.Stat_t); ok {
+			return stat.Ino
+		}
+	}
+	return 0
+}

internal/storage/sqlite/inode_windows.go

@@ -0,0 +1,9 @@
+//go:build windows
+
+package sqlite
+
+// getInode returns 0 on Windows as inodes don't exist.
+// Used for debugging file replacement detection in tests.
+func getInode(_ string) uint64 {
+	return 0
+}