Fix process memory provider base address sync and live refresh

Provider base address now stays in sync with tree base address when
changed via ChangeBase command, fixing reads from arbitrary memory
regions like KUSER_SHARED_DATA at 0x7FFE0000. ReadProcessMemory
handles partial reads gracefully. Snapshot extent uses tree-based
calculation instead of provider size to avoid oversized reads.
MCP source.switch gains pid parameter for programmatic process attach.
MCP server starts by default with logging and slow mode support.

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

src/mcp/mcp_bridge.cpp

@@ -123,6 +123,7 @@ QJsonObject McpBridge::errReply(const QJsonValue& id, int code, const QString& m
 void McpBridge::sendJson(const QJsonObject& obj) {
     if (!m_client) return;
     QByteArray data = QJsonDocument(obj).toJson(QJsonDocument::Compact);
+    qDebug() << "[MCP] >>" << data.left(200);
     data.append('\n');
     m_client->write(data);
     m_client->flush();
@@ -151,6 +152,7 @@ QJsonObject McpBridge::makeTextResult(const QString& text, bool isError) {
 // ════════════════════════════════════════════════════════════════════
 
 void McpBridge::processLine(const QByteArray& line) {
+    qDebug() << "[MCP] <<" << line.trimmed().left(200);
     auto doc = QJsonDocument::fromJson(line);
     if (!doc.isObject()) {
         sendJson(errReply(QJsonValue(), -32700, "Parse error"));
@@ -263,7 +265,7 @@ QJsonObject McpBridge::handleToolsList(const QJsonValue& id) {
     tools.append(QJsonObject{
         {"name", "source.switch"},
         {"description", "Switch active data source (provider). Use sourceIndex for saved sources, "
-                        "or filePath to load a new binary file."},
+                        "filePath to load a binary file, or pid to attach to a live process."},
         {"inputSchema", QJsonObject{
             {"type", "object"},
             {"properties", QJsonObject{
@@ -271,6 +273,10 @@ QJsonObject McpBridge::handleToolsList(const QJsonValue& id) {
                     {"description", "MDI tab index (0-based). Omit for active tab."}}},
                 {"sourceIndex", QJsonObject{{"type", "integer"}}},
                 {"filePath", QJsonObject{{"type", "string"}}},
+                {"pid", QJsonObject{{"type", "integer"},
+                    {"description", "Process ID to attach to for live memory reading."}}},
+                {"processName", QJsonObject{{"type", "string"},
+                    {"description", "Display name for the process (optional with pid)."}}},
                 {"allViews", QJsonObject{{"type", "boolean"}}}
             }}
         }}
@@ -549,10 +555,12 @@ QJsonObject McpBridge::toolTreeApply(const QJsonObject& args) {
     }
 
     // Phase 2: Execute in undo macro
-    ctrl->setSuppressRefresh(true);
+    if (!m_slowMode)
+        ctrl->setSuppressRefresh(true);
     doc->undoStack.beginMacro(macroName);
 
     int applied = 0;
+    uint64_t lastRootStructId = 0;  // track root-level struct inserts
     QStringList skippedOps;
     for (int i = 0; i < ops.size(); i++) {
         // Safety valve: keep paint events flowing for large batches
@@ -594,6 +602,8 @@ QJsonObject McpBridge::toolTreeApply(const QJsonObject& args) {
             }
 
             doc->undoStack.push(new RcxCommand(ctrl, cmd::Insert{n, {}}));
+            if (n.parentId == 0 && n.kind == NodeKind::Struct)
+                lastRootStructId = n.id;
             applied++;
         }
         else if (opType == "remove") {
@@ -722,10 +732,22 @@ QJsonObject McpBridge::toolTreeApply(const QJsonObject& args) {
         else {
             skippedOps.append(QStringLiteral("op[%1]: unknown op '%2'").arg(i).arg(opType));
         }
+
+        // Slow mode: refresh after each operation for visual feedback
+        if (m_slowMode && applied > 0) {
+            ctrl->refresh();
+            QCoreApplication::processEvents(QEventLoop::ExcludeUserInputEvents, 16);
+        }
     }
 
     doc->undoStack.endMacro();
-    ctrl->setSuppressRefresh(false);
+    if (!m_slowMode)
+        ctrl->setSuppressRefresh(false);
+
+    // Auto-switch view to newly created root struct
+    if (lastRootStructId)
+        ctrl->setViewRootId(lastRootStructId);
+
     ctrl->refresh();
 
     // Build response with assigned placeholder IDs
@@ -770,6 +792,14 @@ QJsonObject McpBridge::toolSourceSwitch(const QJsonObject& args) {
                               " (" + sources[idx].displayName + ")");
     }
 
+    if (args.contains("pid")) {
+        uint32_t pid = (uint32_t)args.value("pid").toInteger();
+        QString name = args.value("processName").toString();
+        if (name.isEmpty()) name = QString("PID %1").arg(pid);
+        ctrl->attachToProcess(pid, name);
+        return makeTextResult("Attached to process " + name + " (PID " + QString::number(pid) + ")");
+    }
+
     if (args.contains("filePath")) {
         QString path = args.value("filePath").toString();
         doc->loadData(path);
@@ -777,7 +807,7 @@ QJsonObject McpBridge::toolSourceSwitch(const QJsonObject& args) {
         return makeTextResult("Loaded file: " + path);
     }
 
-    return makeTextResult("Provide sourceIndex or filePath", true);
+    return makeTextResult("Provide sourceIndex, filePath, or pid", true);
 }
 
 // ════════════════════════════════════════════════════════════════════

src/mcp/mcp_bridge.h

@@ -20,6 +20,9 @@ public:
     void stop();
     bool isRunning() const { return m_server != nullptr; }
 
+    bool slowMode() const { return m_slowMode; }
+    void setSlowMode(bool v) { m_slowMode = v; }
+
     // Call from controller refresh / data change to notify MCP clients
     void notifyTreeChanged();
     void notifyDataChanged();
@@ -30,6 +33,7 @@ private:
     QLocalSocket*  m_client    = nullptr;  // single client for v1
     QByteArray     m_readBuffer;
     bool           m_initialized = false;
+    bool           m_slowMode    = false;
 
     // JSON-RPC plumbing
     void onNewConnection();