feat(core-eslint): add no-undeclared-analytics-event ESLint rule

Adds the conformance/no-undeclared-analytics-event rule at warn severity,
mirroring no-undeclared-audit and no-undeclared-event-publish. The rule
cross-checks analytics.track("X", ...) literal slugs in *.use-case.ts
files against manifest.useCases[name].analyticsEvents, providing
sub-second editor feedback before boot-time conformance fires.

- Extends _manifest-ast.js to parse analyticsEvents arrays in both
  extractUseCaseEntry helpers
- Registers rule in plugin.js and base.js at ["warn", { repoRoot }]
- RuleTester fixtures: declared pass, undeclared warn, non-literal no-op,
  non-use-case file no-op, missing manifest entry no-op

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/core-eslint/rules/no-undeclared-analytics-event.test.js

@@ -0,0 +1,155 @@
+import { describe, it } from "vitest";
+import { RuleTester } from "eslint";
+import path from "node:path";
+import os from "node:os";
+import fs from "node:fs";
+import rule from "./no-undeclared-analytics-event.js";
+
+function makeFixture({ manifestUseCases, useCaseBody }) {
+  const repoRoot = fs.mkdtempSync(path.join(os.tmpdir(), "nuae-"));
+  const featureDir = path.join(repoRoot, "packages", "demo");
+  fs.mkdirSync(path.join(featureDir, "src", "application", "use-cases"), {
+    recursive: true,
+  });
+  const useCasesObj = Object.entries(manifestUseCases)
+    .map(
+      ([name, uc]) =>
+        `    ${name}: { mutates: ${uc.mutates}, audits: [], publishes: [], consumes: [], analyticsEvents: [${uc.analyticsEvents.map((e) => `"${e}"`).join(", ")}] },`,
+    )
+    .join("\n");
+  fs.writeFileSync(
+    path.join(featureDir, "src", "feature.manifest.ts"),
+    `export const demoManifest = defineFeature({
+  name: "demo",
+  requiredCores: [],
+  useCases: {
+${useCasesObj}
+  },
+  realtimeChannels: [],
+  jobs: [],
+} as const);`,
+  );
+  const useCaseFile = path.join(
+    featureDir,
+    "src",
+    "application",
+    "use-cases",
+    "sign-up.use-case.ts",
+  );
+  fs.writeFileSync(useCaseFile, useCaseBody);
+  return { repoRoot, useCaseFile };
+}
+
+const tester = new RuleTester({
+  languageOptions: {
+    parser: await import("@typescript-eslint/parser"),
+    ecmaVersion: "latest",
+    sourceType: "module",
+  },
+});
+
+describe("no-undeclared-analytics-event", () => {
+  it("passes when analytics.track slug matches manifest analyticsEvents[]", () => {
+    const { repoRoot, useCaseFile } = makeFixture({
+      manifestUseCases: {
+        signUp: { mutates: true, analyticsEvents: ["user.signed-up"] },
+      },
+      useCaseBody: `export const signUpUseCase = (analytics) => async () => { analytics.track("user.signed-up", {}); };`,
+    });
+    tester.run("no-undeclared-analytics-event", rule, {
+      valid: [
+        {
+          filename: useCaseFile,
+          code: fs.readFileSync(useCaseFile, "utf8"),
+          options: [{ repoRoot }],
+        },
+      ],
+      invalid: [],
+    });
+  });
+
+  it("fires when analytics.track slug is not in manifest", () => {
+    const { repoRoot, useCaseFile } = makeFixture({
+      manifestUseCases: { signUp: { mutates: true, analyticsEvents: [] } },
+      useCaseBody: `export const signUpUseCase = (analytics) => async () => { analytics.track("user.signed-up", {}); };`,
+    });
+    tester.run("no-undeclared-analytics-event", rule, {
+      valid: [],
+      invalid: [
+        {
+          filename: useCaseFile,
+          code: fs.readFileSync(useCaseFile, "utf8"),
+          options: [{ repoRoot }],
+          errors: [
+            {
+              messageId: "undeclared",
+              data: { event: "user.signed-up", useCase: "signUp" },
+            },
+          ],
+        },
+      ],
+    });
+  });
+
+  it("is a no-op when analytics.track is called with a non-literal argument", () => {
+    const { repoRoot, useCaseFile } = makeFixture({
+      manifestUseCases: { signUp: { mutates: true, analyticsEvents: [] } },
+      useCaseBody: `export const signUpUseCase = (analytics, slug) => async () => { analytics.track(slug, {}); };`,
+    });
+    tester.run("no-undeclared-analytics-event", rule, {
+      valid: [
+        {
+          filename: useCaseFile,
+          code: fs.readFileSync(useCaseFile, "utf8"),
+          options: [{ repoRoot }],
+        },
+      ],
+      invalid: [],
+    });
+  });
+
+  it("is a no-op for files that are not use-case files", () => {
+    const repoRoot = fs.mkdtempSync(path.join(os.tmpdir(), "nuae-"));
+    const featureDir = path.join(repoRoot, "packages", "demo");
+    fs.mkdirSync(path.join(featureDir, "src", "application"), {
+      recursive: true,
+    });
+    const controllerFile = path.join(
+      featureDir,
+      "src",
+      "application",
+      "sign-up.controller.ts",
+    );
+    fs.writeFileSync(
+      controllerFile,
+      `export const signUpController = (analytics) => async () => { analytics.track("user.signed-up", {}); };`,
+    );
+    tester.run("no-undeclared-analytics-event", rule, {
+      valid: [
+        {
+          filename: controllerFile,
+          code: fs.readFileSync(controllerFile, "utf8"),
+          options: [{ repoRoot }],
+        },
+      ],
+      invalid: [],
+    });
+  });
+
+  it("is a no-op when manifest has no entry for the use case", () => {
+    const { repoRoot, useCaseFile } = makeFixture({
+      manifestUseCases: {},
+      useCaseBody: `export const signUpUseCase = (analytics) => async () => { analytics.track("user.signed-up", {}); };`,
+    });
+    tester.run("no-undeclared-analytics-event", rule, {
+      valid: [
+        {
+          filename: useCaseFile,
+          code: fs.readFileSync(useCaseFile, "utf8"),
+          options: [{ repoRoot }],
+        },
+      ],
+      invalid: [],
+    });
+  });
+});