Ξ-W2-T1 remediation: print master gain into the bake, derive the window from the dialed sound, reset play mode to Trigger

src/shell/persist/session.h

@@ -7,8 +7,7 @@
 //     JSON bridge, GUID minting, bank-folder relocation (see ext_state_io.h).
 //   * prune_fs.cpp     — pruneDryRun/pruneOrphanSet/pruneReclaim: the prune
 //     scan and THE SINGLE FILE-DELETION AUTHORITY over user files in the bank
-//     folder. Nothing else in the system deletes bank-folder bytes (a shell's
-//     self-cleanup of its own transient scratch file is not this authority).
+//     folder, plus the one self-cleanup carve-out from it, both stated there.
 //
 // Save: BankModel JSON -> SetProjExtState under namespace "reasampler" (ext
 // state lives inside the .rpp, so the index travels with the project for
@@ -64,6 +63,13 @@ public:
     model::BankModel& bank() { return book_.activeIndex(); }
     const model::BankModel& bank() const { return book_.activeIndex(); }
 
+    // The project whose book/view/tail/ledger poll() last loaded — compare-only, never
+    // dereferenced; nullptr before the first poll. An action that can be fired against a
+    // project other than the one currently loaded here (the VST bake, which targets its own
+    // instance's tab) MUST check this before mutating: the book in memory belongs to one
+    // project, and landing another tab's request would write its capture into this bank.
+    const void* loadedProject() const { return lastProject_; }
+
     // Design-View model; persists MODEL STATE only (visibility on open is the view shell's job).
     ViewModeModel& view() { return view_; }
     const ViewModeModel& view() const { return view_; }