v0.8.1 — docs correction + stealth opt-out

Added

• BROWSE_MCP_NO_STEALTH=1: opt out of the navigator.webdriver strip for operators whose target sites'' ToS expect automation to identify itself.

Fixed

• README no longer claims Readability is "fetched from unpkg at runtime" — it has been bundled via the @mozilla/readability npm dependency since 0.3.0 (no runtime network fetch, works offline). Stale claim flagged by external review; the npm package page now shows the corrected docs.