Add integration test coverage policy

ARCHITECTURE.md

@@ -60,6 +60,7 @@ If a struct exceeds 50 fields, group related fields into sub-structs (e.g., `Dif
 - **No print-only tests:** `std::cout << "PASS"` without a preceding assertion is forbidden.
 - **Test pattern:** Use the standard `expect()` helper, `int passed/failed` counters, `return failed ? 1 : 0`.
 - **Edge cases:** At least 1 edge case test per step (empty input, null, boundary).
+- **Coverage continuity:** If a test is removed or simplified, add equivalent coverage in a new unit or integration test and note the replacement in the commit/progress log.
 
 ---
 

editor/CMakeLists.txt

@@ -706,6 +706,16 @@ add_executable(step125_test tests/step125_test.cpp)
 target_include_directories(step125_test PRIVATE src)
 target_link_libraries(step125_test PRIVATE nlohmann_json::nlohmann_json)
 
+add_executable(step125_integration_test tests/step125_integration_test.cpp)
+target_include_directories(step125_integration_test PRIVATE src)
+target_link_libraries(step125_integration_test PRIVATE
+    imgui::imgui
+    nlohmann_json::nlohmann_json
+    unofficial::tree-sitter::tree-sitter
+    tree_sitter_python
+    tree_sitter_cpp
+    tree_sitter_elisp)
+
 find_package(SDL2 CONFIG REQUIRED)
 find_package(OpenGL REQUIRED)
 find_package(glad CONFIG REQUIRED)

editor/tests/step125_integration_test.cpp

@@ -0,0 +1,54 @@
+// Step 125 Integration Test: EditorState agent mutation flow
+#include "EditorUtils.h"
+#include "imgui.h"
+#include <iostream>
+
+static void expect(bool cond, const std::string& name, int& passed, int& failed) {
+    if (cond) {
+        std::cout << "Test " << (passed + failed + 1) << " PASS: " << name << "\n";
+        ++passed;
+    } else {
+        std::cout << "Test " << (passed + failed + 1) << " FAIL: " << name << "\n";
+        ++failed;
+    }
+}
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+
+    EditorState state;
+    auto buf = std::make_unique<BufferState>();
+    buf->path = "(untitled)";
+    buf->language = "python";
+    buf->bufferMode = BufferManager::BufferMode::Structured;
+    auto mod = std::make_unique<Module>("root", "OldName", "python");
+    buf->sync.setAST(std::move(mod));
+    buf->orchestrator.setAST(cloneModule(buf->sync.getAST()));
+    buf->orchestratorDirty = false;
+    state.bufferStates[buf->path] = std::move(buf);
+    state.activeBuffer = state.bufferStates["(untitled)"].get();
+
+    state.agentMutationPermissions["agent_1"] = false;
+    json mutReq = {
+        {"jsonrpc","2.0"},
+        {"id",1},
+        {"method","applyMutation"},
+        {"params", {{"type","setProperty"}, {"nodeId","root"}, {"property","name"}, {"value","NewName"}}}
+    };
+    json mutRes = state.processAgentRequest(mutReq, "agent_1");
+    expect(mutRes.contains("error"), "mutation blocked", passed, failed);
+
+    state.agentMutationPermissions["agent_1"] = true;
+    json mutRes2 = state.processAgentRequest(mutReq, "agent_1");
+    expect(mutRes2.contains("result"), "mutation allowed", passed, failed);
+    Module* astAfter = state.activeAST();
+    expect(astAfter && astAfter->name == "NewName", "mutation applied", passed, failed);
+
+    std::cout << "\n=== Step 125 Integration Results: " << passed << " passed, " << failed << " failed ===\n";
+    ImGui::DestroyContext();
+    return failed == 0 ? 0 : 1;
+}