Fix runtime PRIMITIVES for dom/browser library functions

dom.sx and browser.sx are library source (not transpiled into the bundle),
so their functions need explicit PRIMITIVES registration for runtime-eval'd
SX code (islands, data-init scripts). Restore registrations for all dom/
browser functions used at runtime. Revert bootstrap.py transpilation of
dom-lib/browser-lib which overrode native platform implementations that
have essential runtime integration (cekCall wrapping, post-render hooks).

Add Playwright regression test for [object Object] nav link issue.
Replace console-log calls with log-info in init-client.sx.txt.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/playwright/isomorphic.spec.js

@@ -136,6 +136,24 @@ test.describe('Isomorphic SSR', () => {
     await context.close();
   });
 
+  test('navigation links have valid URLs (no [object Object])', async ({ page }) => {
+    await page.goto(BASE_URL + '/sx/', { waitUntil: 'networkidle' });
+    await page.waitForTimeout(1000);
+
+    // Check all nav links for [object Object] — regression for FFI primitive overrides
+    const brokenLinks = await page.evaluate(() => {
+      const links = document.querySelectorAll('a[href]');
+      const broken = [];
+      for (const a of links) {
+        if (a.href.includes('[object') || a.href.includes('object%20Object')) {
+          broken.push({ href: a.href, text: a.textContent.trim().slice(0, 40) });
+        }
+      }
+      return broken;
+    });
+    expect(brokenLinks).toEqual([]);
+  });
+
   test('navigation preserves header island state', async ({ page }) => {
     await page.goto(BASE_URL + '/sx/', { waitUntil: 'networkidle' });