feat: enum/bitfield editing, MCP guard rails, PDB anonymous type inlining

- Enum inline editing: name/value commit handling, auto-sort by value
- Bitfield support in PDB import with proper container nodes
- Per-member hover/selection highlighting (kMemberBit encoding)
- Context menu fixes for enum/bitfield member lines
- MCP pagination (limit/offset), includeMembers param, tree.search tool
- MCP status bar activity indicator for tool calls
- PDB anonymous type inlining: inline <unnamed-tag> types as children
- Skip anonymous pointer targets to prevent root orphans
- Enum import diagnostics for debugging missing enums

src/controller.h

@@ -98,6 +98,8 @@ public:
     void duplicateNode(int nodeIdx);
     void convertToTypedPointer(uint64_t nodeId);
     void splitHexNode(uint64_t nodeId);
+    void toggleBitfieldBit(uint64_t nodeId, int memberIdx);
+    void editBitfieldValue(uint64_t nodeId, int memberIdx);
     void showContextMenu(RcxEditor* editor, int line, int nodeIdx, int subLine, const QPoint& globalPos);
     void batchRemoveNodes(const QVector<int>& nodeIndices);
     void batchChangeKind(const QVector<int>& nodeIndices, NodeKind newKind);