fix(gui): move Calibrate AGC-T under Clear ATU Memories and shorten its label (#5835). Principle XIII. (#5836)

## Summary

Fixes #5835

### What was changed

fix(gui): move Calibrate AGC-T under Clear ATU Memories and shorten its
label (#5835). Principle XIII.

### Files modified

- `src/gui/MainWindow_Menus.cpp`

```
 src/gui/MainWindow_Menus.cpp | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)
```

---
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<sub>🤖 aethersdr-agent · cost: $1.0445 · model: claude-opus-5</sub>

Co-authored-by: aethersdr-agent[bot] <273844287+aethersdr-agent[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: aethersdr-agent[bot]

src/gui/MainWindow_Menus.cpp

@@ -1318,6 +1318,21 @@ void MainWindow::buildMenuBar()
             m_appletPanel->txApplet()->confirmAndClearAtuMemories();
         }
     });
+    // Discoverability mitigation for AGC-T calibration's right-click-only
+    // entry point (docs/agc-t-calibration-design.md §0 flags this exact
+    // tension and prescribes a mitigation — this is the Tools-menu half of
+    // it, additive to the slider's right-click menu, not a replacement).
+    // Requested by Larry, KE2ET. Targets the active slice, same as the
+    // right-click path (RxApplet.cpp) — "the currently selected panadapter."
+    // No kTxKeyingProperty: calibration listens to the noise floor, it does
+    // not key the transmitter like the two sweeps above it.
+    auto* agcTCalibrationAction = toolsMenu->addAction(
+        "Calibrate AGC-T...", this, [this] {
+        if (auto* s = activeSlice()) {
+            showAgcCalibrationDialog(s->sliceId());
+        }
+    });
+    m_agcTCalibrationMenuAction = agcTCalibrationAction;
 
     toolsMenu->addSeparator();
     viewMenu->removeAction(callsignLookupAct);
@@ -1395,19 +1410,6 @@ void MainWindow::buildMenuBar()
     auto* gpsDashboardAction = toolsMenu->addAction("GPS Dashboard...", this, [this] {
         showGpsLocationDialog();
     });
-    // Discoverability mitigation for AGC-T calibration's right-click-only
-    // entry point (docs/agc-t-calibration-design.md §0 flags this exact
-    // tension and prescribes a mitigation — this is the Tools-menu half of
-    // it, additive to the slider's right-click menu, not a replacement).
-    // Requested by Larry, KE2ET. Targets the active slice, same as the
-    // right-click path (RxApplet.cpp) — "the currently selected panadapter."
-    auto* agcTCalibrationAction = toolsMenu->addAction(
-        "Calibrate AGC-T Against Noise Floor...", this, [this] {
-        if (auto* s = activeSlice()) {
-            showAgcCalibrationDialog(s->sliceId());
-        }
-    });
-    m_agcTCalibrationMenuAction = agcTCalibrationAction;
     toolsMenu->addAction(networkAction);
     toolsMenu->addAction("Runtime Monitor...", this, [this] {
         showSystemInfoDialog();