Add the FX reclaimer: a debounced, time-boxed convergence loop that offlines parked chains and restores returning ones off the switch path

src/shell/view/view_park.h

@@ -29,6 +29,12 @@ inline const char* trackFlagParm(Flag f) {
     return "B_SHOWINTCP";  // unreachable; keeps the compiler quiet
 }
 
+// The FX's own durable identity, braced exactly like the track GUID keys, empty when
+// REAPER reports none. The ONE such read: the park's snapshot and the reclaimer's
+// resolve must address the same chain by the same names, or a restore lands one
+// plugin's state on another. See its definition for the stability caveat.
+std::string fxGuidString(MediaTrack* tr, int fx);
+
 // A re-park's FX half, unioned rather than overwritten: keeps every FX identity
 // `prior` already names (the user's real pre-park state, still offline while the
 // reclaimer hasn't run) and appends whatever identity `live` sees that `prior`