Sprint 2 Step 4: annotation concepts (DerefStrategy, OptimizationLock, LangSpecific)

Adds the three annotation types from SemAnno. Test builds SimpleFunctionExample
with @deref(batched), exercises OptimizationLock on Module, LangSpecific on
Variable, and DerefStrategy's derefTime child link.

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

editor/src/ast/Annotation.h

@@ -0,0 +1,41 @@
+#pragma once
+#include "ASTNode.h"
+
+class Annotation : public ASTNode {
+public:
+    Annotation() { conceptType = "Annotation"; }
+};
+
+class DerefStrategy : public Annotation {
+public:
+    std::string strategy;
+    std::string derefLocation;
+    std::string owner;
+    DerefStrategy() { conceptType = "DerefStrategy"; }
+    DerefStrategy(const std::string& id, const std::string& strategy)
+        : strategy(strategy) {
+        this->id = id;
+        this->conceptType = "DerefStrategy";
+    }
+    // children: derefTime (0..1) via setChild("derefTime", ...)
+};
+
+class OptimizationLock : public Annotation {
+public:
+    std::string lockedBy;
+    std::string lockReason;
+    std::string lockLevel;
+    std::string affectedStrategies;
+    std::string timestamp;
+    OptimizationLock() { conceptType = "OptimizationLock"; }
+};
+
+class LangSpecific : public Annotation {
+public:
+    std::string language;
+    std::string idiomType;
+    std::string rawSyntax;
+    std::string semanticHint;
+    std::string position;
+    LangSpecific() { conceptType = "LangSpecific"; }
+};