refactor(provider-core): share attachment prompts, notifications, and event loggers (#17330)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
e38b6a188fJulius Marminge committed on 10/8/2026, 11:34:47 PM· committed by GitHubparentd81afa0
37 files changedLine totals unavailable