`open` waits for the `load` event by default. SPAs whose `load` never fires
(a long-pending XHR or a stuck sub-resource holds it open) made `open`
hard-fail after the lifecycle timeout — even though the DOM was ready and
eval/screenshot worked immediately right after.
- Graceful degradation: if the lifecycle event times out but document.readyState
is interactive/complete, navigate returns success carrying a `warning` in the
response (the CLI prints it to stderr; --json keeps the field) instead of
erroring. Only a still-loading document is a real failure.
- `open/goto/navigate` now accept `--wait-until <load|domcontentloaded|
networkidle|none>` so SPAs can return as soon as the DOM is parsed. The URL
parser skips the --wait-until value so it isn't mistaken for the URL.
- WaitUntil::as_str() for the warning label; output.rs surfaces response warnings.
Verified live: --wait-until domcontentloaded returns immediately on a page whose
load never fires; default load on the same page now succeeds at the timeout with
a clear stderr warning instead of failing. Adds parse tests for both arg orders
+ bogus value.
leeguooooo
b4c1707a01