Merge pull request #692: feat(header): opt-in GPU and CPU clock readings after CPU and MEM

Conflict in config/test-suites.ts resolved by keeping both sides: #689's
header-divider and #692's header-host-sensors browser tests are both
listed in BROWSER_TEST_GLOBS.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

config/test-suites.ts

@@ -27,6 +27,7 @@ export const BROWSER_TEST_GLOBS = [
   'test/tab-focus.browser.test.ts',
   'test/session-sidebar-ux.browser.test.ts',
   'test/header-divider.browser.test.ts',
+  'test/header-host-sensors.browser.test.ts',
   'test/session-options-responsive.browser.test.ts',
   'test/inline-rename.test.ts',
   'test/opencode-resize.test.ts',