Add Sprints 60-61: Language Graduation and Certification Pipeline (Steps 829-848)

Sprint 60: Language Graduation and Full-Matrix Release (Steps 829-838)
Sprint 61: Continuous Matrix Certification Pipeline (Steps 839-848)

All 90 tests passing across both sprints.

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

editor/tests/step838_test.cpp

@@ -0,0 +1,54 @@
+// Step 838: HistoricalRegressionChecker tests (8 tests)
+#include "graduation/HistoricalRegressionChecker.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(empty_not_clean);
+    auto r=HistoricalRegressionChecker::run({});
+    C(!r.clean,"not clean");P();}
+
+void t2(){T(all_pass_clean);
+    std::vector<RegressionCheckItem> items={{"C1","desc",true},{"C2","desc",true}};
+    auto r=HistoricalRegressionChecker::run(items);
+    C(r.clean,"clean");P();}
+
+void t3(){T(partial_not_clean);
+    std::vector<RegressionCheckItem> items={{"C1","desc",true},{"C2","desc",false}};
+    auto r=HistoricalRegressionChecker::run(items);
+    C(!r.clean,"not clean");P();}
+
+void t4(){T(totalChecks_count);
+    std::vector<RegressionCheckItem> items={{"C1","d",true},{"C2","d",false}};
+    auto r=HistoricalRegressionChecker::run(items);
+    C(r.totalChecks==2,"totalChecks");P();}
+
+void t5(){T(passedChecks_count);
+    std::vector<RegressionCheckItem> items={{"C1","d",true},{"C2","d",false}};
+    auto r=HistoricalRegressionChecker::run(items);
+    C(r.passedChecks==1,"passedChecks");P();}
+
+void t6(){T(items_preserved);
+    std::vector<RegressionCheckItem> items={{"C1","d",true}};
+    auto r=HistoricalRegressionChecker::run(items);
+    C(r.items.size()==1,"items size");P();}
+
+void t7(){T(toJson);
+    auto r=HistoricalRegressionChecker::run({});
+    auto j=HistoricalRegressionChecker::toJson(r);
+    C(j.contains("total"),"total");C(j.contains("items"),"items");P();}
+
+void t8(){T(toJson_has_clean_key);
+    auto r=HistoricalRegressionChecker::run({});
+    auto j=HistoricalRegressionChecker::toJson(r);
+    C(j.contains("clean"),"clean key");P();}
+
+int main(){
+    std::cout<<"Step 838: HistoricalRegressionChecker\n";
+    t1();t2();t3();t4();t5();t6();t7();t8();
+    std::cout<<"\nResults: "<<p<<"/"<<(p+f)<<" passed\n";
+    return f?1:0;
+}