v1.9.0

## What's Changed


* fix: dts bug hotifx by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/530
* improve error handling by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/527
* feat: robust aborting by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/532
* fix(core): prevent concurrent execute() calls by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/536

And

* fix(website): normalize trailing slash in sidebar location comparison by @tolerious in https://github.com/alibaba/page-agent/pull/506
* chore: upgrade deps by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/520
* fix: temporarily patch WXT audit vulnerabilities by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/525
* chore(deps-dev): bump concurrently from 9.2.1 to 10.0.3 in the development-major group by @dependabot[bot] in https://github.com/alibaba/page-agent/pull/524
* chore: typo by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/526
* chore(llms): add vitest unit tests by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/531
* docs(website): document ctx.signal abort contract and execute() concurrency by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/539
* feat(llms): add Claude Opus 4.8 support by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/540
* docs: update model list by @gaomeng1900 in https://github.com/alibaba/page-agent/pull/541

## New Contributors
* @tolerious made their first contribution in https://github.com/alibaba/page-agent/pull/506

**Full Changelog**: https://github.com/alibaba/page-agent/compare/v1.8.2...v1.9.0