feat(ui): add operator UI server, stores, and insights

tests/env-store.test.ts

@@ -0,0 +1,35 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { mkdtemp, readFile, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { resolve } from "node:path";
+import { parseEnvFile, writeEnvFileUpdates } from "../src/ui/env-store.js";
+
+test("parseEnvFile handles missing files", async () => {
+  const root = await mkdtemp(resolve(tmpdir(), "ai-ops-env-store-"));
+  const envPath = resolve(root, ".env");
+
+  const parsed = await parseEnvFile(envPath);
+  assert.deepEqual(parsed.values, {});
+  assert.deepEqual(parsed.lines, []);
+});
+
+test("writeEnvFileUpdates merges and appends keys", async () => {
+  const root = await mkdtemp(resolve(tmpdir(), "ai-ops-env-store-"));
+  const envPath = resolve(root, ".env");
+
+  await writeFile(envPath, "FOO=bar\nAGENT_MAX_CONCURRENT=4\n", "utf8");
+
+  const updated = await writeEnvFileUpdates(envPath, {
+    AGENT_MAX_CONCURRENT: "9",
+    AGENT_RUNTIME_DISCORD_MIN_SEVERITY: "warning",
+  });
+
+  assert.equal(updated.values.FOO, "bar");
+  assert.equal(updated.values.AGENT_MAX_CONCURRENT, "9");
+  assert.equal(updated.values.AGENT_RUNTIME_DISCORD_MIN_SEVERITY, "warning");
+
+  const rendered = await readFile(envPath, "utf8");
+  assert.match(rendered, /AGENT_MAX_CONCURRENT=9/);
+  assert.match(rendered, /AGENT_RUNTIME_DISCORD_MIN_SEVERITY=warning/);
+});