LaunchOptions::from_env() and LaunchOptions::default() now return
BrowserMode::Headless. The in-process daemon (via CrawlerConfig::from_env)
and the standalone crawler binary both pick this up — no display
required for production runs, smaller resource footprint.
`Headed` stays as an explicit opt-in via CRAWLER_BROWSER_MODE=headed
for debugging or sites that fingerprint headless Chrome. New unit test
locks the default in place.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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