clients: document supervisory/array-write parity gotchas and add advise-supervisory to all CLIs

A consuming project hit two MXAccess parity surprises: a plain Write only
records its user_id when the item has an active supervisory advise (the path
to take when not authenticating), and array writes replace the whole array
rather than patching individual elements. Document both across the five client
READMEs and gateway.md's compatibility baseline, and expose the missing
advise-supervisory subcommand in the go/python/rust/java CLIs (plus the .NET
help text) so callers can establish the supervisory advise without dropping to
the raw command API.

clients/java/README.md

@@ -84,6 +84,46 @@ yields alarm-feed messages from the gateway's central monitor), and
 `acknowledgeAlarm` (ack by full alarm reference with an optional comment and
 ack target). Close the subscription to cancel the underlying gRPC stream.
 
+## Write Semantics And Common Pitfalls
+
+These are MXAccess parity behaviors that surprise new callers. The gateway
+forwards them unchanged — it does not paper over them.
+
+### Attributing a write to a user without `authenticateUser`
+
+MXAccess only stamps a plain `write`/`write2` with a Galaxy user id when the
+item carries an active *supervisory* advise. If you are **not** using the
+verified/secured path (`authenticateUser` → `writeSecured`/`writeSecured2`) but
+still need the write attributed to a user id, you must first advise the item
+supervisory and then pass that user id on the write. Without the supervisory
+advise the `userId` on a plain write is ignored.
+
+The session exposes `advise`/`unAdvise` but not supervisory advise, so send it
+through the generic command channel:
+
+```java
+session.invokeCommand(MxCommand.newBuilder()
+        .setKind(MxCommandKind.MX_COMMAND_KIND_ADVISE_SUPERVISORY)
+        .setAdviseSupervisory(AdviseSupervisoryCommand.newBuilder()
+                .setServerHandle(serverHandle)
+                .setItemHandle(itemHandle))
+        .build());
+
+session.write(serverHandle, itemHandle, value, userId);
+```
+
+The CLI exposes the same command as `advise-supervisory`, and `write` /
+`write2` take `--user-id`.
+
+### Array writes replace the whole array
+
+A write to an array attribute **replaces the entire array**; it is not an
+element-wise patch. To change a subset of elements, send the full array with
+the unchanged elements included. For example, to change 2 elements of a
+20-element array, build the `MxValue` from all 20 values (the 18 unchanged plus
+the 2 new ones). Sending only the 2 changed values overwrites the attribute
+with a 2-element array.
+
 ## Galaxy Repository Browse
 
 The Galaxy Repository service is a separate metadata-only gRPC service exposed

clients/java/zb-mom-ww-mxgateway-cli/src/main/java/com/zb/mom/ww/mxgateway/cli/MxGatewayCli.java

@@ -153,6 +153,8 @@ public final class MxGatewayCli implements Callable<Integer> {
         commandLine.addSubcommand("register", new RegisterCommand(clientFactory));
         commandLine.addSubcommand("add-item", new AddItemCommand(clientFactory));
         commandLine.addSubcommand("advise", new AdviseCommand(clientFactory));
+        commandLine.addSubcommand(
+                "advise-supervisory", new AdviseSupervisoryCommand(clientFactory));
         commandLine.addSubcommand("subscribe-bulk", new SubscribeBulkCommand(clientFactory));
         commandLine.addSubcommand("unsubscribe-bulk", new UnsubscribeBulkCommand(clientFactory));
         commandLine.addSubcommand("read-bulk", new ReadBulkCommand(clientFactory));
@@ -1044,6 +1046,34 @@ public final class MxGatewayCli implements Callable<Integer> {
         }
     }
 
+    @Command(
+            name = "advise-supervisory",
+            description = "Invokes MXAccess AdviseSupervisory.")
+    static final class AdviseSupervisoryCommand extends GatewayCommand {
+        @Option(names = "--session-id", required = true, description = "Gateway session id.")
+        String sessionId;
+
+        @Option(names = "--server-handle", required = true, description = "MXAccess server handle.")
+        int serverHandle;
+
+        @Option(names = "--item-handle", required = true, description = "MXAccess item handle.")
+        int itemHandle;
+
+        AdviseSupervisoryCommand(MxGatewayCliClientFactory clientFactory) {
+            super(clientFactory);
+        }
+
+        @Override
+        public Integer call() {
+            try (MxGatewayCliClient client = clientFactory.connect(common.resolved())) {
+                MxCommandReply reply =
+                        client.session(sessionId).adviseSupervisoryRaw(serverHandle, itemHandle);
+                writeOutput("advise-supervisory", common, json, reply, () -> reply.getKind().name());
+            }
+            return 0;
+        }
+    }
+
     @Command(name = "subscribe-bulk", description = "Invokes MXAccess SubscribeBulk.")
     static final class SubscribeBulkCommand extends GatewayCommand {
         @Option(names = "--session-id", required = true, description = "Gateway session id.")
@@ -1830,6 +1860,8 @@ public final class MxGatewayCli implements Callable<Integer> {
 
         MxCommandReply adviseRaw(int serverHandle, int itemHandle);
 
+        MxCommandReply adviseSupervisoryRaw(int serverHandle, int itemHandle);
+
         MxCommandReply writeRaw(int serverHandle, int itemHandle, MxValue value, int userId);
 
         List<SubscribeResult> subscribeBulk(int serverHandle, List<String> items);
@@ -1948,6 +1980,17 @@ public final class MxGatewayCli implements Callable<Integer> {
             return session.adviseRaw(serverHandle, itemHandle);
         }
 
+        @Override
+        public MxCommandReply adviseSupervisoryRaw(int serverHandle, int itemHandle) {
+            return session.invokeCommand(MxCommand.newBuilder()
+                    .setKind(MxCommandKind.MX_COMMAND_KIND_ADVISE_SUPERVISORY)
+                    .setAdviseSupervisory(
+                            mxaccess_gateway.v1.MxaccessGateway.AdviseSupervisoryCommand.newBuilder()
+                                    .setServerHandle(serverHandle)
+                                    .setItemHandle(itemHandle))
+                    .build());
+        }
+
         @Override
         public MxCommandReply writeRaw(int serverHandle, int itemHandle, MxValue value, int userId) {
             return session.writeRaw(serverHandle, itemHandle, value, userId);

clients/java/zb-mom-ww-mxgateway-cli/src/test/java/com/zb/mom/ww/mxgateway/cli/MxGatewayCliTests.java

@@ -1302,6 +1302,15 @@ final class MxGatewayCliTests {
                     .build();
         }
 
+        @Override
+        public MxCommandReply adviseSupervisoryRaw(int serverHandle, int itemHandle) {
+            adviseCalled = true;
+            return MxCommandReply.newBuilder()
+                    .setKind(MxCommandKind.MX_COMMAND_KIND_ADVISE_SUPERVISORY)
+                    .setProtocolStatus(ok())
+                    .build();
+        }
+
         @Override
         public MxCommandReply writeRaw(int serverHandle, int itemHandle, MxValue value, int userId) {
             lastWriteValue = value;