feat: update skills to use verified Browserbase sessions

[Kylejeong2]

Summary

• replace --advanced-stealth references with --verified in Browserbase CLI skill docs
• update skill copy to describe Browserbase remote mode in terms of Identity and Verified browsers instead of stealth
• rename the cookie-sync helper flag from --stealth to --verified and set browserSettings.verified = true

Validation

• node --check skills/cookie-sync/scripts/cookie-sync.mjs
• rg -n --hidden --glob '!*node_modules*' --glob '!*dist*' "advanced stealth|--advanced-stealth|--stealth|advancedStealth|anti-bot stealth|stealth mode" .

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Note

Low Risk
Low risk documentation and CLI-flag updates, with a small behavior change in cookie-sync.mjs to request verified Browserbase sessions; main risk is breaking users relying on the old --stealth flag.

Overview
Shifts all skill copy/examples to describe Browserbase remote mode in terms of Browserbase Identity + Verified browsers rather than stealth/advanced-stealth, including updating bb sessions create examples from --advanced-stealth to --verified.

Renames the cookie-sync script flag from --stealth to --verified and changes session creation to set browserSettings.verified = true when requested.

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