chore: import upstream snapshot with attribution

tests/unit/compression/rtk-renderers-integration.test.ts

@@ -0,0 +1,43 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { processRtkText } from "../../../open-sse/services/compression/engines/rtk/index.ts";
+import { applyRenderer } from "../../../open-sse/services/compression/engines/rtk/renderers/index.ts"; // sanity import
+
+// keep unused import check quiet
+void applyRenderer;
+
+const GIT_DIFF = `diff --git a/x.ts b/x.ts
+index 111..222 100644
+--- a/x.ts
++++ b/x.ts
+@@ -1,3 +1,3 @@
+-const a = 1;
++const a = 2;
+ const b = 3;`;
+
+test("enableRenderers default false ⇒ baseline unchanged", () => {
+  const off = processRtkText(GIT_DIFF, { command: "git diff", config: { enabled: true } });
+  const explicitOff = processRtkText(GIT_DIFF, {
+    command: "git diff",
+    config: { enabled: true, enableRenderers: false },
+  });
+  assert.equal(off.text, explicitOff.text); // renderer não roda por default
+});
+
+test("enableRenderers true ⇒ git diff is rendered through processRtkText", () => {
+  const on = processRtkText(GIT_DIFF, {
+    command: "git diff",
+    config: { enabled: true, enableRenderers: true },
+  });
+  assert.ok(on.techniquesUsed.includes("rtk-render:git-diff"));
+  assert.ok(!on.text.includes("index ")); // contexto/metadata dropado
+});
+
+test("fail-open: renderer error keeps prior result", () => {
+  // entrada que detecta git-diff mas é benigna; renderer não deve lançar nem alterar incorretamente
+  const r = processRtkText("not really a diff", {
+    command: "git diff",
+    config: { enabled: true, enableRenderers: true },
+  });
+  assert.ok(typeof r.text === "string"); // nunca lança
+});