Add Sprints 46-59: governance, porting foundation, and language graduation prep (Steps 689-828)

Sprints 46-58 implement the cross-language porting foundation: language-to-IR
adapters, equivalence checking, gate validation, legacy ingestion, managed/dynamic
families, low-level/logic-actor semantics, debug workflow tooling, AST-native
family tools, Rust/CPP raising tools, system-level orchestration, query family,
and porting gates. Sprint 59 adds the governance layer (policy packs, review
boards, waiver packets, ambiguity triage, decision ledger) with the
whetstone_review_porting_decision MCP tool.

Also includes: sprint plans 46-130, MCP taskitem pipeline scripts,
CLAUDE.md, docs, and full test matrix (steps 689-828).

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

editor/src/cpp_ir/CppTemplateRaisingPolicy.h

@@ -0,0 +1,42 @@
+#pragma once
+// Step 712: generics/template raising policy.
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+#include <nlohmann/json.hpp>
+
+#include "SemanticCoreIR.h"
+
+struct CppTemplateDecision {
+    std::string nodeId;
+    std::string templateForm; // class_template, fn_template, concrete
+    bool conceptConstrained = false;
+};
+
+class CppTemplateRaisingPolicy {
+public:
+    static std::vector<CppTemplateDecision> raise(const SemanticCoreIR& ir,
+                                                  const std::string& profile = "safe-first") {
+        std::vector<CppTemplateDecision> out;
+        for (const auto& n : ir.nodes) {
+            if (!n.metadata.contains("genericParams")) continue;
+            CppTemplateDecision d;
+            d.nodeId = n.id;
+            d.templateForm = (n.kind == IRNodeKind::Type) ? "class_template" : "fn_template";
+            d.conceptConstrained = profile != "interop-first";
+            out.push_back(std::move(d));
+        }
+        std::sort(out.begin(), out.end(), [](const auto& a, const auto& b){ return a.nodeId < b.nodeId; });
+        return out;
+    }
+
+    static nlohmann::json toJson(const std::vector<CppTemplateDecision>& v) {
+        nlohmann::json j = nlohmann::json::array();
+        for (const auto& d : v) {
+            j.push_back({{"nodeId", d.nodeId}, {"templateForm", d.templateForm}, {"conceptConstrained", d.conceptConstrained}});
+        }
+        return j;
+    }
+};