Sprint 66 (Steps 889-898): Runtime Semantics Packs — framework and platform awareness

Adds 8 graduation headers: RuntimeSemanticsPack, RuntimePackLoader,
RuntimeAssumptionExtractor, RuntimeAwareLowering, RuntimeRaisingPolicy,
RuntimeVerificationPlugin, RuntimeCompatibilityRiskReport, RuntimeProfileStore.
MCP tools: whetstone_get_runtime_assumptions + whetstone_set_runtime_profile.
All 10 steps pass (86 tests total across sprint 66).

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

editor/tests/step896_test.cpp

@@ -0,0 +1,50 @@
+// Step 896: Runtime profile store (8 tests)
+#include "graduation/RuntimeProfileStore.h"
+#include <iostream>
+static int p=0,f=0;
+#define T(n) { std::cout << "  " << #n << "... "; }
+#define P() { std::cout << "PASS\n"; ++p; }
+#define F(m) { std::cout << "FAIL: " << m << "\n"; ++f; }
+#define C(c,m) if(!(c)){F(m);return;}
+
+void t1(){T(set_and_get);
+    RuntimeProfileStore s;
+    s.set({"p1","jvm11","11"});
+    auto* pr=s.get("p1");
+    C(pr&&pr->runtimeId=="jvm11","get");P();}
+void t2(){T(get_unknown_null);
+    RuntimeProfileStore s;
+    C(s.get("unknown")==nullptr,"null");P();}
+void t3(){T(has_after_set);
+    RuntimeProfileStore s;
+    s.set({"p1","jvm11","11"});
+    C(s.has("p1"),"has");P();}
+void t4(){T(not_has_unknown);
+    RuntimeProfileStore s;
+    C(!s.has("unknown"),"not has");P();}
+void t5(){T(set_overwrites);
+    RuntimeProfileStore s;
+    s.set({"p1","jvm11","11"});
+    s.set({"p1","cpython3","3.11"});
+    C(s.get("p1")->runtimeId=="cpython3","overwrite");P();}
+void t6(){T(count_correct);
+    RuntimeProfileStore s;
+    s.set({"p1","jvm11","11"});
+    s.set({"p2","cpython3","3.11"});
+    C(s.count()==2,"count");P();}
+void t7(){T(list_returns_ids);
+    RuntimeProfileStore s;
+    s.set({"p1","jvm11","11"});
+    C(s.list().size()==1,"list");P();}
+void t8(){T(clear_removes_all);
+    RuntimeProfileStore s;
+    s.set({"p1","jvm11","11"});
+    s.clear();
+    C(s.count()==0,"clear");P();}
+
+int main(){
+    std::cout<<"Step 896: Runtime profile store\n";
+    t1();t2();t3();t4();t5();t6();t7();t8();
+    std::cout<<"\nResults: "<<p<<"/"<<(p+f)<<" passed\n";
+    return f?1:0;
+}