Accept + implement ADR-010 frontend plugin hooks (contract 0.7.0)

Four data-only hooks on BasePlugin (get_settings_cards,
get_asset_panels, get_map_overlays, get_asset_presentation) with a
GET-only /api/pluginui consumer surface copying the dashboard-widgets
semantics. Pilots: warranty declares its asset panel; measuringtools
supplies its settings card, presentation, and calibration overlay -
the last hardcoded settings-nav entry is now hook-sourced. Generic
renderers for panels/overlays/presentation deferred per the ADR's
incremental adoption plan (documented in CONTRACT-STABILITY.md).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

plugins/measuringtools/plugin.py

@@ -94,6 +94,46 @@ class MeasuringToolsPlugin(BasePlugin):
         # plugin guide as the intentional empty-schema case.
         return []
 
+    def get_settings_cards(self) -> List[Dict]:
+        # ADR-010 pilot. Contributes the Measuring Tools settings card that used
+        # to be hardcoded in the core settingsNav.js catalog.
+        return [
+            {
+                'group': 'Measuring Tools',
+                'to': '/settings/measuringtooltypes',
+                'icon': 'ruler',
+                'title': 'Measuring Tool Types',
+                'description': 'Manage measuring-tool subtypes (caliper, '
+                               'micrometer, thread gage...) + map colors',
+                'position': 22,
+            },
+        ]
+
+    def get_asset_presentation(self) -> List[Dict]:
+        # ADR-010 pilot. Tells core how to render + link the measuring_tool
+        # asset type in global-search rows and cross-links.
+        return [
+            {
+                'assettype': 'measuring_tool',
+                'icon': 'ruler',
+                'label': 'Measuring Tool',
+                'route': '/measuringtools/{assetid}',
+            },
+        ]
+
+    def get_map_overlays(self) -> List[Dict]:
+        # ADR-010 pilot. Declares a calibration-due badge overlay for the
+        # shop-floor map; the map fetches the endpoint to decorate markers.
+        return [
+            {
+                'id': 'calibration-due',
+                'label': 'Calibration due',
+                'endpoint': '/api/measuringtools/map-overlay',
+                'style': 'badge',
+                'legend': True,
+            },
+        ]
+
     def init_app(self, app: Flask, db_instance) -> None:
         logger.info(f"Measuring-tools plugin initialized (v{self.meta.version})")