feat: add cmd/hanzovfs-bench (runnable native-VFS benchmark)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cmd/hanzovfs-bench/main.go

@@ -0,0 +1,45 @@
+// hanzovfs-bench measures the native Hanzo SQLite VFS (in-process, encrypted,
+// no FUSE). Run anywhere: go run github.com/hanzoai/sqlite3/cmd/hanzovfs-bench@latest
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"time"
+
+	"github.com/hanzoai/sqlite3"
+	_ "github.com/hanzoai/sqlite3/embed"
+	"github.com/hanzoai/sqlite3/hanzovfs"
+)
+
+func bench(label, dsn string) {
+	db, err := sqlite3.Open(dsn)
+	if err != nil { fmt.Printf("%-26s OPEN ERR %v\n", label, err); return }
+	defer db.Close()
+	db.Exec(`PRAGMA journal_mode=MEMORY; PRAGMA synchronous=OFF;`)
+	db.Exec(`CREATE TABLE t(id INTEGER PRIMARY KEY, email TEXT, body TEXT)`)
+	const n = 20000
+	t0 := time.Now()
+	db.Exec("BEGIN")
+	st, _, _ := db.Prepare("INSERT INTO t(email,body) VALUES(?,?)")
+	for i := 0; i < n; i++ {
+		st.BindText(1, fmt.Sprintf("u%d@hanzo.ai", i))
+		st.BindText(2, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")
+		st.Step(); st.Reset()
+	}
+	st.Close(); db.Exec("COMMIT")
+	ins := float64(n) / time.Since(t0).Seconds()
+	t0 = time.Now()
+	sel, _, _ := db.Prepare("SELECT body FROM t WHERE id=?")
+	for i := 0; i < 5000; i++ { sel.BindInt(1, 1+(i*7)%n); sel.Step(); sel.Reset() }
+	sel.Close()
+	fmt.Printf("%-26s insert=%9.0f rows/s   point_sel=%9.0f q/s\n", label, ins, 5000/time.Since(t0).Seconds())
+}
+
+func main() {
+	fmt.Printf("hanzovfs-bench on %s/%s (%d CPU)\n", runtime.GOOS, runtime.GOARCH, runtime.NumCPU())
+	hanzovfs.Register("raw", false)
+	hanzovfs.Register("enc", true)
+	bench("native block-vfs (raw)", "file:/r.db?vfs=raw")
+	bench("native block-vfs +AEAD", "file:/e.db?vfs=enc")
+}