feat(core-eslint): no-undeclared-event-publish rule

AST-aware ESLint rule that catches bus.publish("X") calls in use-case
files where X is not declared in the matching manifest.useCases[name].publishes array.

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

packages/core-eslint/rules/no-undeclared-event-publish.js

@@ -0,0 +1,56 @@
+import { parseManifestUseCases } from "./_manifest-ast.js";
+import { useCaseNameFromFile } from "./_usecase-name.js";
+import { manifestPathForFeature, featureRootForFile } from "./_manifest-source.js";
+
+/** @type {import("eslint").Rule.RuleModule} */
+export default {
+  meta: {
+    type: "problem",
+    docs: {
+      description:
+        "bus.publish(\"X\") inside a use-case factory must declare X in manifest.useCases[name].publishes.",
+    },
+    schema: [
+      {
+        type: "object",
+        properties: { repoRoot: { type: "string" } },
+        additionalProperties: false,
+      },
+    ],
+    messages: {
+      undeclared:
+        "{{useCase}} calls bus.publish(\"{{event}}\") but {{event}} is not declared in manifest.useCases.{{useCase}}.publishes. Add it to the manifest or remove the call.",
+    },
+  },
+  create(context) {
+    const opts = context.options[0] ?? {};
+    const repoRoot = opts.repoRoot ?? context.cwd ?? process.cwd();
+    const filename = context.filename;
+    const useCaseName = useCaseNameFromFile(filename);
+    if (!useCaseName) return {};
+    const featureRoot = featureRootForFile(filename, repoRoot);
+    if (!featureRoot) return {};
+    const manifest = parseManifestUseCases(manifestPathForFeature(featureRoot));
+    if (!manifest || !manifest[useCaseName]) return {};
+    const declared = new Set(manifest[useCaseName].publishes);
+    return {
+      CallExpression(node) {
+        if (
+          node.callee.type === "MemberExpression" &&
+          node.callee.object.type === "Identifier" &&
+          node.callee.object.name === "bus" &&
+          node.callee.property.type === "Identifier" &&
+          node.callee.property.name === "publish" &&
+          node.arguments.length > 0 &&
+          node.arguments[0].type === "Literal" &&
+          typeof node.arguments[0].value === "string"
+        ) {
+          const event = node.arguments[0].value;
+          if (!declared.has(event)) {
+            context.report({ node, messageId: "undeclared", data: { event, useCase: useCaseName } });
+          }
+        }
+      },
+    };
+  },
+};