feat(plugins): isolate device integrations

packages/plugin-sdk/README.md

@@ -36,6 +36,8 @@ The separate SDK v0alpha2 package establishes executable contracts for:
 - independently revisioned enrollment, connectivity, and acquisition states;
 - operation policy, request, acknowledgement, progress, completion, failure,
   timeout, cancellation, secret reference, and idempotency boundaries;
+- immutable pre-session runtime-action invocation and result envelopes used by
+  the active backend dispatcher;
 - canonical point cloud, pose, image, encoded video, and device-status streams;
 - immutable evidence handles, raw transport records, lineage, and store
   protocol;
@@ -49,11 +51,13 @@ compatibility profile and adapter.
 
 Current host implementation references:
 
-- `apps/control-station/src/core/device-plugins/` — TypeScript manifest and UI
-  contribution contracts;
+- `apps/control-station/src/core/device-plugins/frontendSdk.ts` — current
+  public TypeScript/React host surface for statically reviewed UI contributions;
+- `plugins/xgrids-k1/frontend/` — first physically plugin-owned consumer of
+  that frontend surface;
 - `apps/control-station/src/core/runtime/` — normalized runtime envelope;
 - `src/k1link/web/plugin_catalog.py` — strict backend manifest validation;
-- `src/k1link/web/plugin_runtime.py` — host-owned allowlisted action dispatcher;
+- `src/k1link/web/plugin_runtime.py` — host-owned allowlisted SDK-envelope action dispatcher;
 - `src/k1link/web/device_plugin_composition.py` — manifest factory loader and
   startup parity checks;
 - `docs/adr/0003-device-plugin-ui-and-runtime-boundary.md` — accepted boundary
@@ -66,6 +70,11 @@ milestone. v0alpha2 models secret references and operation policy, but host
 authorization and the actual secret vault remain separate implementation
 responsibilities.
 
+The React surface is not yet an independently published npm package. Its alias
+is intentionally narrow so plugin source cannot import Control Station
+implementation paths; packaging and signing it belong to the supervisor/bundle
+milestone.
+
 ## Version policy
 
 v0alpha2 may receive additive fields while it remains experimental. A breaking