chore: import upstream snapshot with attribution

tests/unit/compression/quantumLockIntegration.test.ts

@@ -0,0 +1,50 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import {
+  applyCompression,
+  applyCompressionAsync,
+} from "../../../open-sse/services/compression/strategySelector.ts";
+import { TAIL_DELIM } from "../../../open-sse/services/compression/quantumLock/quantumPatterns.ts";
+
+const sysBody = () => ({
+  messages: [
+    { role: "system", content: "Agent. Session 550e8400-e29b-41d4-a716-446655440000 active." },
+    { role: "user", content: "hi" },
+  ],
+});
+const sysText = (b: Record<string, unknown>) => (b.messages as Array<{ content: string }>)[0].content;
+
+const QL_ON = { quantumLock: { enabled: true } };
+const ANTHROPIC = { cachingContext: { provider: "anthropic" } };
+
+test("caching provider + quantumLock ⇒ system UUID stabilized + stats emitted", () => {
+  const r = applyCompression(sysBody(), "lite", { config: QL_ON as never, ...ANTHROPIC });
+  assert.ok(sysText(r.body).includes(TAIL_DELIM));
+  assert.equal(r.stats?.quantumLock?.fragments, 1);
+});
+
+test("disabled quantumLock ⇒ byte-identical to baseline", () => {
+  const base = applyCompression(sysBody(), "lite", { ...ANTHROPIC });
+  assert.equal(sysText(base.body).includes(TAIL_DELIM), false);
+});
+
+test("non-caching provider ⇒ no-op (body byte-identical)", () => {
+  const r = applyCompression(sysBody(), "lite", {
+    config: QL_ON as never,
+    cachingContext: { provider: "ollama" },
+  });
+  assert.equal(sysText(r.body).includes(TAIL_DELIM), false);
+});
+
+test("async entry point stabilizes too", async () => {
+  const r = await applyCompressionAsync(sysBody(), "stacked", {
+    config: { ...QL_ON, stackedPipeline: [{ engine: "caveman" }] } as never,
+    ...ANTHROPIC,
+  });
+  assert.ok(sysText(r.body).includes(TAIL_DELIM));
+});
+
+test("user/assistant messages are untouched", () => {
+  const r = applyCompression(sysBody(), "lite", { config: QL_ON as never, ...ANTHROPIC });
+  assert.equal((r.body.messages as Array<{ content: string }>)[1].content, "hi");
+});