Add safe bank failure diagnostics for T5 and T6

Address #14 with request correlation, bounded parser reasons, startup version reporting, and rate-limited storage and settlement logs. Preserve accounting and API identity contracts, extend portable tests, and update release versions and rollout guidance.

tools/tests/bank_component_cases.cpp

@@ -0,0 +1,38 @@
+
+// Executed with the actual registration adapter and portable engine interfaces.
+#include <fstream>
+int main()
+{
+    bank::component component;
+    component.on_startup(nullptr);
+    const auto call = [](const std::string& name, std::vector<std::string> args = {})
+    {
+        return gsc::function::functions.at(name)(args);
+    };
+    assert(call("bankversion").as<std::string>() == "1.2.0");
+    auto ack = call("bankresponse", {"private-secret-invalid-json"}).as<scripting::array>();
+    assert(!ack["valid"].as<bool>());
+    assert(ack["reason"].as<std::string>() == "invalid_json");
+    assert(ack["code"].as<std::string>().empty());
+    assert(call("bankload", {"server", "endpoint"}).is<scripting::array>());
+    for (int i = 0; i < 2; ++i)
+        assert(!call("bankstore", {"server", "endpoint", "private-secret Authorization"}).as<bool>());
+    const std::string body = R"({"server":"server","request_id":"one","decision":"cancel"})";
+    assert(call("bankstore", {"server", "endpoint", body}).as<bool>());
+    const auto root = bank::spool("server", "endpoint");
+    assert(root.load().size() == 1);
+    // Locate only the test process's temporary outbox.
+    std::filesystem::path file;
+    for (const auto& entry : std::filesystem::recursive_directory_iterator("tws-bank"))
+        if (entry.path().extension() == ".json") file = entry.path();
+    assert(!file.empty());
+    { std::ofstream stream(file); stream << "private-secret-corrupt-journal"; }
+    for (int i = 0; i < 2; ++i)
+    {
+        assert(call("bankload", {"server", "endpoint"}).get_raw().type == game::SCRIPT_NONE);
+        assert(!call("bankremove", {"server", "endpoint", "one"}).as<bool>());
+    }
+    std::filesystem::remove(file);
+    assert(call("bankload", {"server", "endpoint"}).is<scripting::array>());
+    assert(call("bankremove", {"server", "endpoint", "one"}).as<bool>());
+}