feat(ksuid): add BinExpr, flexible parsers, and expression helpers

Adds ParseStringKSUIDAny, ParseBinaryKSUIDAny, BinaryKSUID.BinExpr, and
ExprStringKSUIDs for portal-compatible KSUID handling at API boundaries.

Co-authored-by: Cursor <cursoragent@cursor.com>

ksuid_binary.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 
+	"github.com/go-jet/jet/v2/mysql"
 	"github.com/segmentio/ksuid"
 )
 
@@ -43,6 +44,14 @@ func ParseBinaryKSUID(b []byte) (BinaryKSUID, error) {
 	return BinaryKSUID{KSUID: id}, nil
 }
 
+// BinExpr returns a Jet string expression for binary-encoded IN clauses.
+func (b BinaryKSUID) BinExpr() mysql.StringExpression {
+	if b.IsNil() {
+		return mysql.StringExp(mysql.NULL)
+	}
+	return mysql.String(string(b.Bytes()))
+}
+
 // AsStringKSUID returns a StringKSUID view of the same identifier.
 func (b BinaryKSUID) AsStringKSUID() StringKSUID {
 	return StringKSUID{KSUID: b.KSUID}