fix(cli): report the response status in the capture command's JSON output

The status reached `CaptureResult` and was then dropped at the CLI boundary,
which is the same read-once-and-discard that made the error page harvestable
in the first place. `--json` is the documented programmatic surface, and an
agent reading `ok: true` off a capture of a 404 has no way to see it there.

Author: miguel-heygen

packages/cli/src/commands/capture.ts

@@ -204,6 +204,9 @@ export default defineCommand({
               ok: result.ok,
               projectDir: result.projectDir,
               url: result.url,
+              // Reported beside `ok`, because they answer different questions: a capture of an
+              // error page is `ok: true` with a status the caller has to see to know it.
+              httpStatus: result.httpStatus,
               title: result.title,
               screenshots: result.screenshots.length,
               assets: result.assets.length,