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/step898_test.cpp

@@ -0,0 +1,31 @@
+// Step 898: Sprint 66 integration summary (6 tests)
+#include "Sprint66IntegrationSummary.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(sprint_number);
+    C(Sprint66IntegrationSummary::sprintNumber==66,"num");P();}
+void t2(){T(steps_completed);
+    C(Sprint66IntegrationSummary::stepsCompleted==10,"steps");P();}
+void t3(){T(theme_set);
+    std::string t=Sprint66IntegrationSummary::theme;
+    C(!t.empty(),"theme");P();}
+void t4(){T(verify_true);
+    C(Sprint66IntegrationSummary::verify(),"verify");P();}
+void t5(){T(to_json_sprint_field);
+    auto j=Sprint66IntegrationSummary::toJson();
+    C(j.contains("sprint")&&j["sprint"]==66,"json");P();}
+void t6(){T(to_json_tools_added);
+    auto j=Sprint66IntegrationSummary::toJson();
+    C(j.contains("tools_added"),"tools");P();}
+
+int main(){
+    std::cout<<"Step 898: Sprint 66 integration summary\n";
+    t1();t2();t3();t4();t5();t6();
+    std::cout<<"\nResults: "<<p<<"/"<<(p+f)<<" passed\n";
+    return f?1:0;
+}