feat: expand gameplay and state persistence

- add character imprint, awakening, and equipment refinement

- add equipment ticket gacha and persistent progression fields

- add request-scoped account transactions with crash recovery

- persist age confirmation and isolate client plugin patches

- separate one-off save repair tools from shipped tooling

go/cmd/bd2server/main_test.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestValidateAccountStatePathsRequiresOneTransactionDirectory(t *testing.T) {
+	root := t.TempDir()
+	progress := filepath.Join(root, "progress.json")
+	deck := filepath.Join(root, "deck.json")
+	if err := validateAccountStatePaths(root, progress, deck); err != nil {
+		t.Fatal(err)
+	}
+	if err := validateAccountStatePaths(root, filepath.Join(root, "renamed.json"), deck); err == nil {
+		t.Fatal("renamed progress escaped transaction allow-list")
+	}
+	if err := validateAccountStatePaths(root, progress, filepath.Join(t.TempDir(), "deck.json")); err == nil {
+		t.Fatal("deck outside account transaction directory was accepted")
+	}
+}