test(ci): deterministic deploy gate + advisory quality suite; sync README versions

The deploy gate ran e2e specs that depend on live content and data, so a missing
upload (the /help article images) or a legacy malformed avatar figure could turn
a safe code deploy red. Split the suites by what they actually guarantee:

- Blocking gate (`pnpm test:e2e`, `playwright.config.ts`): only checks the CMS
  can guarantee itself — anonymous redirects, register form fields, the captcha
  DOM contract and the cache-control headers (deterministic origin-direct).
- Advisory suite (`pnpm test:e2e:quality`, `playwright.quality.config.ts`):
  broken images, layout overflow and warm-page latency, which depend on live
  content/upload state and the host. It runs as a `continue-on-error` CI job
  against the public site so a real content problem stays visible without
  blocking the pipeline.

Also add `scripts/sync-readme-versions.mjs` (+ tests, docs and a CI check) so
the pinned versions in README.md can never drift from package.json / .nvmrc.

playwright.quality.config.ts

@@ -0,0 +1,29 @@
+import { defineConfig, devices } from "@playwright/test";
+
+// Advisory quality suite. Unlike the main e2e config (the blocking deploy
+// gate), this checks things that depend on live content and data — broken
+// uploads, legacy malformed avatar figures, warm-page latency. Those are real
+// signals but they are not something a code change can guarantee, so they must
+// never block a deploy. Point it at a running CMS with PLAYWRIGHT_BASE_URL
+// (defaults to the local host port).
+const baseURL = process.env.PLAYWRIGHT_BASE_URL || "http://127.0.0.1:3002";
+
+export default defineConfig({
+	testDir: "./e2e/quality",
+	fullyParallel: false,
+	workers: 1,
+	retries: 1,
+	timeout: 60000,
+	expect: { timeout: 15000 },
+	reporter: [
+		["list"],
+		["html", { outputFolder: "playwright-report/quality", open: "never" }],
+	],
+	outputDir: "test-results/quality",
+	use: {
+		baseURL,
+		trace: "retain-on-failure",
+		screenshot: "only-on-failure",
+	},
+	projects: [{ name: "chromium", use: { ...devices["Desktop Chrome"] } }],
+});