Q-W1 pt2: core/shell/app relocation + sub-namespaces; one concrete ui::Rect (LTRB fork retired); slot_map split from bank_book; BankIndex→BankModel; 59/59 green

src/ext_keys.h

@@ -1,3 +1,4 @@
+#include "core/namespaces.h"
 #pragma once
 // ext_keys — the SINGLE SOURCE OF TRUTH for the "reasampler" project ext-state
 // namespace + key names, shared by the extension (writer, via persist.h) and the
@@ -15,7 +16,7 @@
 // stored state. Changing any of them orphans that state. See persist.h for the
 // per-key retirement / migration semantics — this header only owns the spellings.
 
-#include "app_version.h"
+#include "core/version/app_version.h"
 
 namespace reasampler {