fix: verify-references installs TS deps; sync-check covers expansion tests; template gitignore and passWithNoTests

verify-references ran a bare `npx vitest run` in the staged reference, which
fetched an unrelated vitest that could not load the reference config. It now
installs the reference's devDependencies first. sync-check also checks each
module's expansion/tests against ### headings in expansion/README.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

workspace-template/rust/.gitignore

@@ -0,0 +1 @@
+target/

workspace-template/ts/.gitignore

@@ -0,0 +1 @@
+node_modules/

workspace-template/ts/vitest.config.ts

@@ -1,5 +1,5 @@
 import { defineConfig } from "vitest/config";
 
 export default defineConfig({
-  test: { include: ["tests/**/*.test.ts"] },
+  test: { include: ["tests/**/*.test.ts"], passWithNoTests: true },
 });