feat(FN-3470): prefer source aliases for runtime plugins and add test artif

Merges FN-3470 in two steps: first, runtime plugins now prefer source path aliases over build artifacts, with hardening tests for vitest alias resolution and plugin view registry updates; second, a new `ensure-test-artifacts.mjs` bootstrap script guarantees required test files exist before test runs

Fusion-Task-Id: FN-3470

scripts/__tests__/vitest-source-aliases.test.mjs

@@ -0,0 +1,41 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { URL } from "node:url";
+
+function read(path) {
+  return readFileSync(new URL(`../../${path}`, import.meta.url), "utf8");
+}
+
+test("dashboard vitest config aliases runtime plugins to src", () => {
+  const content = read("packages/dashboard/vitest.config.ts");
+  assert.match(content, /@fusion-plugin-examples\/hermes-runtime/);
+  assert.match(content, /@fusion-plugin-examples\/openclaw-runtime/);
+  assert.match(content, /@fusion-plugin-examples\/paperclip-runtime/);
+  assert.match(content, /plugins\/fusion-plugin-hermes-runtime\/src\/index\.ts/);
+  assert.match(content, /plugins\/fusion-plugin-openclaw-runtime\/src\/index\.ts/);
+  assert.match(content, /plugins\/fusion-plugin-paperclip-runtime\/src\/index\.ts/);
+});
+
+test("cli vitest config aliases runtime plugins to src", () => {
+  const content = read("packages/cli/vitest.config.ts");
+  assert.ok(content.includes("@fusion-plugin-examples\\/droid-runtime"));
+  assert.ok(content.includes("@fusion-plugin-examples\\/hermes-runtime"));
+  assert.ok(content.includes("@fusion-plugin-examples\\/openclaw-runtime"));
+  assert.ok(content.includes("@fusion-plugin-examples\\/paperclip-runtime"));
+  assert.match(content, /plugins\/fusion-plugin-hermes-runtime\/src\/index\.ts/);
+  assert.match(content, /plugins\/fusion-plugin-openclaw-runtime\/src\/index\.ts/);
+  assert.match(content, /plugins\/fusion-plugin-paperclip-runtime\/src\/index\.ts/);
+});
+
+test("engine and plugin-sdk vitest configs keep source aliases", () => {
+  const engine = read("packages/engine/vitest.config.ts");
+  const sdk = read("packages/plugin-sdk/vitest.config.ts");
+
+  assert.match(engine, /@fusion\/core/);
+  assert.match(engine, /\.\.\/core\/src\/index\.ts/);
+  assert.match(engine, /@fusion\/plugin-sdk/);
+
+  assert.match(sdk, /@fusion\/core/);
+  assert.match(sdk, /\.\.\/core\/src\/index\.ts/);
+});