Fix linux build: replace removed syscall.Fadvise with unix.Fadvise

syscall.Fadvise was removed in Go 1.26. Use golang.org/x/sys/unix instead.

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/modelcontextprotocol/go-sdk v1.4.0
 	github.com/zeebo/xxh3 v1.1.0
 	golang.org/x/sync v0.19.0
+	golang.org/x/sys v0.40.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
@@ -17,5 +18,4 @@ require (
 	github.com/segmentio/encoding v0.5.3 // indirect
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
 	golang.org/x/oauth2 v0.34.0 // indirect
-	golang.org/x/sys v0.40.0 // indirect
 )

internal/pipeline/prefetch_linux.go

@@ -4,7 +4,8 @@ package pipeline
 
 import (
 	"os"
-	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 func advisePrefetch(f *os.File) {
@@ -13,5 +14,5 @@ func advisePrefetch(f *os.File) {
 		return
 	}
 	// POSIX_FADV_WILLNEED = 3: advise kernel to read file into page cache
-	_ = syscall.Fadvise(int(f.Fd()), 0, fi.Size(), 3)
+	_ = unix.Fadvise(int(f.Fd()), 0, fi.Size(), unix.FADV_WILLNEED)
 }