agent: add adapter for Baidu Search

[alectimison-maker]

Summary

Adds a mirrored Baidu Search adapter for Chrome and Firefox.

Without this adapter, the agent can mistake ads or generated-answer blocks for organic evidence, infer redirect destinations from snippets, or lose the search task when Baidu sends the tab to its separate verification host.

• Scope matching to Baidu web, mobile, image, video, account, and observed wappass.baidu.com verification surfaces without hijacking Maps, Tieba, Pan, or Baike.
• Distinguish web/news/video/image result types, paid placements, generated answers, redirects, pagination, and lazy-loaded media cards.
• Preserve the query and backurl across 百度安全验证, stopping for manual completion instead of bypassing or looping.
• Keep public search usable without forcing account login.
• Add positive, negative, phishing-lookalike, product-isolation, challenge, guidance, and Chrome/Firefox parity assertions.

Validation

• Targeted Baidu production, isolation, challenge, and parity assertions: passed.
• Anonymous Chrome/Playwright read-only check: home and image search returned HTTP 200; web search redirected to wappass.baidu.com/static/captcha/... with title 百度安全验证, and the final URL selected the baidu-search adapter after the matcher was extended.
• node test/run.js: 1398/1399 passed; the single failure predates this branch and is the repository's changelog/package version mismatch.
• node test/security/injection-corpus.mjs: 60/60 passed.
• git diff --check: passed.

Compatibility and risks

The change is prompt-only and mirrored across both browser builds. Baidu experiments with result layout and verification frequency, so the notes are dated 2026-08 and avoid unstable result indices.

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