Enforce config example drift checks in CI and release

- add `verify:config-example` script with tests to fail on missing/stale generated config artifacts
- run the verification in CI and release workflows, and document it in release/docs guidance
- fix docs-site Cloudflare Pages watch path to `docs-site/*` with regression coverage

src/ci-workflow.test.ts

@@ -14,3 +14,7 @@ test('ci workflow checks pull requests for required changelog fragments', () =>
   assert.match(ciWorkflow, /bun run changelog:pr-check/);
   assert.match(ciWorkflow, /skip-changelog/);
 });
+
+test('ci workflow verifies generated config examples stay in sync', () => {
+  assert.match(ciWorkflow, /bun run verify:config-example/);
+});