Add per-network device store and targeted discovery

include/linkpulse/device_store.h

@@ -2,15 +2,30 @@
 #define LINKPULSE_DEVICE_STORE_H
 
 #include "linkpulse/discovery.h"
+#include "linkpulse/isp.h"
+
+/* Identifies which physical network (by gateway MAC) an observation belongs
+   to, so devices and ISP identity stay scoped per-router instead of pooled
+   into one global list across every network ever connected to. */
+typedef struct {
+    const char *gateway_mac;
+    const char *gateway_hostname;
+    const char *gateway_vendor;
+    const lp_isp_info_t *isp; /* NULL when not yet known this poll */
+} lp_network_context_t;
 
 /* Opens the per-user MAC-keyed XML device store. The returned handle is opaque. */
 int lp_win32_device_store_open(void **store);
 
-/* Applies persisted label, trust, type, and icon metadata to an observation. */
-void lp_win32_device_store_apply(void *store, lp_neighbor_t *neighbor);
+/* Applies persisted label, trust, type, and icon metadata for the given
+   network's device to an observation. gateway_mac may be NULL/empty for an
+   unresolved network. */
+void lp_win32_device_store_apply(void *store, const char *gateway_mac, lp_neighbor_t *neighbor);
 
-/* Records observed metadata and persists the store atomically. */
-void lp_win32_device_store_observe(void *store, const lp_neighbor_t *neighbor);
+/* Records observed device and ISP metadata under the given network and
+   persists the store atomically. */
+void lp_win32_device_store_observe(void *store, const lp_network_context_t *network_context,
+                                    const lp_neighbor_t *neighbor);
 
 /* Releases the store and any XML resources owned by it. */
 void lp_win32_device_store_close(void *store);

include/linkpulse/discovery.h

@@ -77,6 +77,9 @@ typedef struct {
 typedef lp_status_t (*lp_net_neighbor_snapshot_fn)(lp_neighbor_list_t *out);
 typedef lp_status_t (*lp_net_local_networks_fn)(lp_local_network_list_t *out);
 
+/* Refreshes best-effort name/type metadata for one already-known neighbor. */
+lp_status_t lp_net_refresh_neighbor_identity(lp_neighbor_t *neighbor);
+
 typedef struct {
     lp_net_neighbor_snapshot_fn snapshot_fn;
     lp_net_local_networks_fn local_networks_fn;