Unify cache polling on CACHE_STATUS and split API docs.

Replace separate accel/tap snapshot UART commands with one clients[] response
that omits unsubscribed fields; remove snapshot handlers and CLI commands.
Add goTool/docs for WebSocket streams and REST; tap-snapshot REST uses CACHE_STATUS.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/api_stream.go

@@ -506,8 +506,9 @@ func runAccelStreamer(link *managedSerial, hub *accelStreamHub, dash *wsHub, ctl
 			}
 
 			if wantAccel {
-				clients := make([]AccelClientSample, 0, len(cache.GetAccel()))
-				for _, s := range cache.GetAccel() {
+				samples := accelSamplesFromCacheStatus(cache)
+				clients := make([]AccelClientSample, 0, len(samples))
+				for _, s := range samples {
 					clients = append(clients, AccelClientSample{
 						ClientID: s.GetClientId(),
 						Valid:    s.GetValid(),
@@ -525,8 +526,9 @@ func runAccelStreamer(link *managedSerial, hub *accelStreamHub, dash *wsHub, ctl
 				})
 			}
 			if wantTap {
-				fresh := make([]TapClientEvent, 0, len(cache.GetTaps()))
-				for _, e := range cache.GetTaps() {
+				events := tapEventsFromCacheStatus(cache)
+				fresh := make([]TapClientEvent, 0, len(events))
+				for _, e := range events {
 					if !e.GetValid() {
 						continue
 					}
@@ -537,13 +539,13 @@ func runAccelStreamer(link *managedSerial, hub *accelStreamHub, dash *wsHub, ctl
 						AgeMs:    e.GetAgeMs(),
 					})
 				}
-				events := hub.ingestTapEvents(fresh)
-				if len(events) > 0 {
+				visible := hub.ingestTapEvents(fresh)
+				if len(visible) > 0 {
 					hub.deliverTap(TapStreamMessage{
 						Type:    "tap",
 						T:       now,
 						Success: true,
-						Events:  events,
+						Events:  visible,
 					})
 				}
 			}