docs: describe the TCP transport, multiplexing and TCPStreamJoin in README, architecture and StreamHub docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Docs/E2E-Suite.md

@@ -63,6 +63,11 @@ Full streaming pipeline: MARTe2 (FileReader -> IOGAM -> UDPStreamer) -> StreamHu
 (live, zoom, window, trigger). The validator compares the recording against the analytic
 ground truth (fidelity, sine shape fit, continuity) and optionally a fed-reference tap.
 
+Chain scenarios `s60`-`s73` use TCP transports (`network = "tcp"` or `"tcp_service"`). The
+optional `hub` field adds `{"mode": "mux"}` (the hub takes all sources over one multiplexed
+connection, `s72`) or `{"mode": "join"}` (a `TCPStreamJoin` merges the sources and the hub
+subscribes to the merge, `s73`).
+
 ### direct
 
 MARTe2 FileReader -> UDPStreamer -> UDPStreamerClient -> FileWriter round-trip. Validates that

Docs/StreamHub-API.md

@@ -33,6 +33,9 @@ Reply (unicast): `{"type":"pong"}`.
 - `addr` — `host:port` of the UDPStreamer control port.
 - `multicastGroup` / `dataPort` — optional; if present the hub joins the
   multicast group for DATA and keeps a TCP control connection for CONNECT/CONFIG.
+- `transport` (`"udp"` default, or `"tcp"`) and `streamName` — for a TCP source, the
+  `TCPStreamService` stream to subscribe to. A comma list (`"a,b"`) multiplexes several
+  streams over one connection and adds one source per stream, labelled `<label>_<stream>`.
 - The hub assigns ids `s1`, `s2`, … and broadcasts an updated `sources` event.
 
 ### `removeSource`
@@ -421,6 +424,7 @@ warning.
 [
   {"label": "wave", "addr": "127.0.0.1:44500"},
   {"label": "mc",   "addr": "127.0.0.1:44501", "multicastGroup": "239.0.0.1", "dataPort": 44502},
+  {"label": "svc",  "addr": "127.0.0.1:44500", "transport": "tcp", "streamName": "fast,slow"},
   {"source": "wave", "signal": "Adc", "scale": 0.00030518, "offset": -1.25, "unit": "V"}
 ]
 ```

Docs/StreamHub-UserGuide.md

@@ -58,6 +58,10 @@ Useful flags: `-p <port>` WS port, `-n <pts>` ring size, `-s` skip rebuild,
    ./Client/streamhub/build/StreamHubClient -host <hub-host> -port 8090
    ```
 
+A source can use TCP instead of UDP: add `Transport = "tcp"` (and `StreamName = "<stream>"`
+for a `TCPStreamService`). `StreamName = "a,b"` takes several streams over one connection,
+shown as separate sources `<Label>_a`, `<Label>_b`. See `Docs/TCPStreamer.md`.
+
 Sources can also be added at runtime from either client ("Add source": label +
 `host:port`, optional multicast group/data port). "Save sources" persists the
 runtime list to `streamhub_sources.json` so the hub reloads it on restart.