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* feat(web): gate agent preset selection behind a setting * refactor(web): trim preset visibility diff * refactor(web): simplify agent preset selection policy * test(web): cover agent preset policy branches * refactor(web): tighten agent preset policy flow * fix(web): preserve preset default across picker toggle * docs(web): align agent preset picker docs with the blank-task sync Both picker transitions carry the effective default to the current blank task; started and historical sessions keep their labels, compositions, and recorded history. The Host README states the client rule and links the Web switch; the Agent Note English side matches the Chinese at line 64. Three i18n pairs re-recorded; doc-sync 34/34. * refactor(web): simplify agent preset picker policy * test(web): cover preset policy recovery * docs(web): clarify disabled preset default copy * fix(web): reconcile preset policy races * fix(web): satisfy preset load lint * fix(web): serialize preset roster refreshes * fix(web): release preset refresh before notifying waiters --------- Co-authored-by: ZiyaZhang <[email protected]> Co-authored-by: Chinesezjc <[email protected]>