feat(license): wafer license gate, runtime warning, and first-launch wizard

- Gate READ/ERASE/DEBUG behind wafer license check; log hint to load .bin
- waferRuntimeExceeded() warns when onboard runtime > 350s
- LicenseModel: remove-license (soft hide, .bin stays on disk) via
  removed_licenses.txt; re-loading un-hides
- FirstLaunchWizard: 2-step popup (license + save dir) shown on first run
- Per-tab file memory in HomePage (map/graph/data don't bleed state)
- Merge test_device_controller_license into test_device_controller

src/pygui/backend/visualization/wafer_map_item.py

@@ -378,12 +378,7 @@ class WaferMapItem(QQuickPaintedItem):
                 return idx
         return -1
 
-    # TODO P6.1: build batch export on top of this single-frame export
-    #   THINKING: export_image() already does the hard part (grabToImage → PNG);
-    #   batch export is just a loop over file_browser.files that loads each CSV
-    #   through the existing wafer-map pipeline and calls this per file into a
-    #   chosen output dir, plus an optional summary CSV of (file, min/max/mean).
-    #   No new rendering code needed — see docs/pending/alpha-release-polish-plan.md §6.1.
+
     @Slot(str, result=bool)
     @Slot(str, str, result=bool)
     def export_image(self, file_path: str, extra: str = "") -> bool:
@@ -520,13 +515,6 @@ class WaferMapItem(QQuickPaintedItem):
         r = max(math.hypot(s.x, s.y) for s in self._sensors)
         return r * 1.05
 
-    # TODO P6.2: reuse this for the edge-to-center delta metric
-    #   THINKING: radial_metrics.py (new) needs the same "which sensors are near
-    #   the edge vs. near the center" bucketing this function already computes
-    #   for ring-line drawing — do NOT re-derive ring boundaries separately, this
-    #   already handles round vs. square wafer shapes correctly (see family_spec.py
-    #   square-wafer work). Outermost group ≈ edge sensors, innermost ≈ center.
-    #   See docs/pending/alpha-release-polish-plan.md §6.2.
     def _sensor_ring_radii_mm(self) -> list[float]:
         """Distinct radial distances of sensor groups, sorted ascending, plus the outer boundary."""
         if not self._sensors: