Steps 290-294: Phase 11a — Semanno format, annotation codegen, visitor dispatch (60/60 tests)

Semanno comment format standard (@semanno:type(key=value)) with emitter/parser
covering all 67+ annotation types. SemannoAnnotationImpl CRTP mixin provides
default visitor implementations for all 56 extended annotation methods across
7 language generators. Virtual inheritance resolves diamond ambiguity between
ProjectionGenerator and SemannoAnnotationImpl.

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

editor/src/MCPServer.h

@@ -1236,6 +1236,46 @@ private:
             };
     }
 
+    void registerTrainingDataTools() {
+        // whetstone_export_training_data
+        tools_.push_back({"whetstone_export_training_data",
+            "Export annotated code as training data for LLM fine-tuning. "
+            "Supports HuggingFace (instruction/input/output JSONL) and "
+            "PairsJSONL (raw_code/annotated_code) formats. Includes statistics.",
+            {{"type", "object"}, {"properties", {
+                {"format", {{"type", "string"},
+                    {"description",
+                     "Export format: 'huggingface' or 'pairs' (default: 'huggingface')"}}},
+                {"languages", {{"type", "array"},
+                    {"description",
+                     "Languages to include (default: all available)"},
+                    {"items", {{"type", "string"}}}}}
+            }}}
+        });
+        toolHandlers_["whetstone_export_training_data"] =
+            [this](const json& args) {
+                return callWhetstone("exportTrainingData", args);
+            };
+
+        // whetstone_generate_examples
+        tools_.push_back({"whetstone_generate_examples",
+            "Generate annotated code examples with Semanno comments. "
+            "Takes raw source code and language, returns annotated version "
+            "with inferred annotations from all 8 subjects.",
+            {{"type", "object"}, {"properties", {
+                {"source", {{"type", "string"},
+                    {"description", "Source code to annotate"}}},
+                {"language", {{"type", "string"},
+                    {"description",
+                     "Programming language (python, cpp, rust, etc.)"}}}
+            }}, {"required", json::array({"source", "language"})}}
+        });
+        toolHandlers_["whetstone_generate_examples"] =
+            [this](const json& args) {
+                return callWhetstone("generateExamples", args);
+            };
+    }
+
     void registerWhetstoneTools() {
         registerASTTools();
         registerAnnotationTools();
@@ -1247,5 +1287,6 @@ private:
         registerSidecarTools();
         registerSemanticAnnotationTools();
         registerEnvironmentTools();
+        registerTrainingDataTools();
     }
 };