Tab the PC detail page and add panel groups to the ADR-010 contract

shopdb/plugins/base.py

@@ -370,8 +370,23 @@ class BasePlugin(ABC):
                                       # ('list' takes a 'map' of title/badge/meta
                                       # keys, rendered generically - see warranty)
             'position':   int,        # order among panels
+            'group':      str,        # OPTIONAL. Which tab on the detail page:
+                                      # 'details' | 'software' | 'metrics'
+                                      # | 'actions' | 'activity'. Omitted means
+                                      # 'details'.
         }
 
+        ON 'group'. The detail pages are tabbed, and a panel says which tab it
+        belongs to rather than the page listing panels by id - a page that knew
+        its plugins' panels by name would defeat the point of the hook.
+
+        Omitting it is the correct answer for most panels and keeps every
+        existing plugin working untouched: an unknown or absent group resolves
+        to 'details', which is the tab that holds what an asset IS. Reach for
+        another group only when the panel is the thing that tab exists for -
+        an inventory listing, live telemetry, controls that act on the machine,
+        or a history feed.
+
         Consumed by GET /api/pluginui/asset-panels?assetid=<id>, which returns
         the panels matching that asset's type. Disabled plugins
         are skipped; a broken plugin is isolated in prod, re-raised in dev/test.