Ψ-W3 remediation: fix the verify doc's wrong render source, add missing content checks, soften unverified claims

Corrected the Render-dialog source name the refusal's evidence depends on, added a by-ear content check and a file-size channel proxy, and stopped two comments from overclaiming.

src/shell/capture/capture.h

@@ -80,14 +80,14 @@ struct CaptureRequest {
 // Every failure is an explicit code, never a thrown exception across the REAPER boundary.
 enum class CaptureStatus {
     Ok,
-    NoProject,          // no active project to render / resolve a bank folder
-    EmptyRange,         // start >= end: nothing to render
-    UnsupportedMode,    // backend does not implement this source mode
-    UnsupportedFormat,  // requested bit depth has no known REAPER blob (Float32 only)
-    RenderFailed,       // the render action ran but produced no output file
-    TransportBusy,      // realtime backend: transport already playing/recording — refused
-    MultiTrackSelection,// a selected-tracks render over >1 track — would render N files
-    BoundsMismatch,     // the rendered file's frame count is not the requested window's
+    NoProject,           // no active project to render / resolve a bank folder
+    EmptyRange,          // start >= end: nothing to render
+    UnsupportedMode,     // backend does not implement this source mode
+    UnsupportedFormat,   // requested bit depth has no known REAPER blob (Float32 only)
+    RenderFailed,        // the render action ran but produced no output file
+    TransportBusy,       // realtime backend: transport already playing/recording — refused
+    MultiTrackSelection, // a selected-tracks render over >1 track — would render N files
+    BoundsMismatch,      // the rendered file's frame count is not the requested window's
 };
 
 struct CaptureResult {
@@ -130,7 +130,10 @@ CaptureName captureNameFor(const std::vector<std::string>& sourceNames,
 // A Failed outcome is ALSO logged to the console here, because a successful capture's
 // CaptureResult::message is not printed by any caller — the return value alone would
 // leave a genuine I/O failure indistinguishable from a legitimately stereo capture.
-MonoCollapseOutcome collapseCapturedFileToMono(const std::string& absolutePath);
+// `consoleLabel` matches each caller's own console-prefix convention (offline:
+// "ReaSampler capture"; realtime: "ReaSampler realtime capture").
+MonoCollapseOutcome collapseCapturedFileToMono(const std::string& absolutePath,
+                                               const char* consoleLabel = "ReaSampler capture");
 
 // Stamps the metadata shared by both backends onto `s`: trackGuids (echoed from the
 // request) + channelCount (measured from the produced file's `fmt`; 0/unknown as the