fix(stream_reader): add ASCII hex path + binary resync guard

Family-A wafers never send 0xAA 0x88 framing — _run() now routes
to _run_ascii() on first byte dispatch instead of treating the whole
stream as corrupt binary.

Binary path gets a 16 KB give-up cap (bytes, not attempts) so a
permanently-corrupt port can't stall the reader indefinitely. Raw
wire bytes go to DEBUG only; the ERROR line that surfaces in the
Activity Log is kept free of internal buffer content.

- add family_code param to StreamReader for ASCII decode routing
- add _run_binary give-up cap + DEBUG-only hex diagnostic
- fix stop(): close transport on wedged thread (binary + ASCII paths)
- refactor test_stream_reader: consolidate ASCII regression + resync
  give-up + DEBUG-vs-ERROR log split tests; drop redundant parse_line
- extend test_session_controller: live-stream gate for non-X family
- StreamControlPanel.qml: thread-safe stop on tab leave

src/pygui/ISC/Tabs/components/StreamControlPanel.qml

@@ -110,8 +110,13 @@ Rectangle {
 
                 TabButton {
                     id: liveTab
+                    // Only X-family wafer firmware supports live streaming
+                    // (C# parity, Form1.cs btnConnect_Click) — other families
+                    // have no live-stream protocol to speak.
+                    readonly property string detectedFamily: (deviceController.lastWaferInfo && deviceController.lastWaferInfo.length > 0) ? deviceController.lastWaferInfo[0] : ""
+                    readonly property bool familySupportsStream: detectedFamily === "X"
                     text: "Live"
-                    enabled: deviceController.connectionStatus === "Connected"
+                    enabled: deviceController.connectionStatus === "Connected" && familySupportsStream
                     opacity: enabled ? 1.0 : 0.4
                     Layout.fillWidth: true
                     implicitHeight: 24
@@ -120,7 +125,9 @@ Rectangle {
 
                     AppToolTip {
                         visible: disabledHover.containsMouse && !liveTab.enabled
-                        text: "Connect a wafer to enable Live mode"
+                        text: deviceController.connectionStatus !== "Connected"
+                            ? "Connect a wafer to enable Live mode"
+                            : "Live mode is only supported on X-family wafers (detected " + liveTab.detectedFamily + ")"
                         delay: 300
                     }
 
@@ -359,12 +366,14 @@ Rectangle {
             text: streamController.mode === "live" ? "STOP" : "START"
             enabled: streamController.mode === "live"
                      ? true
-                     : deviceController.connectionStatus === "Connected"
+                     : (deviceController.connectionStatus === "Connected" && liveTab.familySupportsStream)
             opacity: enabled ? 1.0 : 0.4
 
             AppToolTip {
                 visible: primaryBtn.hovered && !primaryBtn.enabled
-                text: "Connect a wafer to enable Live mode"
+                text: deviceController.connectionStatus !== "Connected"
+                    ? "Connect a wafer to enable Live mode"
+                    : "Live mode is only supported on X-family wafers (detected " + liveTab.detectedFamily + ")"
                 delay: 300
             }