feat(plugins): isolate device integrations

plugins/xgrids-k1/frontend/README.md

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+# XGRIDS K1 frontend contribution
+
+This source tree is owned by the XGRIDS device plugin and is statically linked
+into the reviewed Mission Core Control Station build. It is not part of the
+generic application source tree.
+
+The contribution contains:
+
+- `K1ProvisioningPipeline` for power confirmation, BLE discovery and the
+  reviewed Wi-Fi provisioning write;
+- `K1AcquisitionPipeline` for live receiver preparation, operator-manual K1
+  start/stop and compatibility file replay;
+- plugin-local diagnostics, metrics, API state, lifecycle mapping,
+  observation-source mapping and scoped styles;
+- `plugin.ts`, which binds the manifest `device.connection` component key to
+  the runtime provider and connection view.
+
+Imports from the host are limited to `@mission-core/plugin-sdk`, the public
+frontend host surface, plus React and the NODE.DC UI kit. The only generic
+Control Station import of this plugin is the reviewed composition root.
+Arbitrary runtime JavaScript discovery is intentionally unsupported.