docs harness: 'verify-docs reports pass/fail counts' stalls on CI #4450

The docs-harness test "verify-docs reports pass/fail counts" (web/sites/guides/scripts/verify-docs/test/orchestrator.test.mjs) stalls on CI.

• Run 37385398443 (docs(cli): describe deploy build, logs and prune as they now work #4441): it hung for 300 s, the test timeout, and the rest of the job hung until it was cancelled.
• Since fix(docs): bound every harness command so a stuck wheels can't hang the run #4447 (bounded runExec()): it fails after ~240 s with 2 !== 0. That's the default command timeout firing inside the verify-docs child, which then exits 2. Example: run 37391990630, test 59, 241.5 s.
• Other runs: it passes in ~5–11 s on other runs and locally (macOS). In the failing run, the same wheels operations are fast in neighbouring tests: resetFixture's wheels new takes 2.7 s, and the mini-tutorial with a dev server takes 11.9 s.

The test doesn't print the child's output, so the log doesn't say which wheels command stalls. In the child, it's either the warm-up wheels system paths, the {test:cli} / {test:compile} blocks, or the tutorial step's wheels new.

Since #4444, the harness step is blocking, so this fails "Verify docs" on PRs.

Next:

1. The test prints the child's stdout/stderr when it fails, so CI names the stuck command.
2. On CI it's skipped (not failed) while this is open.
3. Find and fix the stall, then remove the skip.