feat: add breaking_news input to manual podcast trigger workflow (#502)
* feat: add breaking_news input to manual podcast trigger workflow - Add trigger-podcast.yml workflow with breaking_news workflow_dispatch input - Add --breaking-news CLI argument to podcaster_handoff.py - Include breaking_news in handoff payload when provided Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * test+docs: add breaking_news tests and document field in architecture.md - Add test asserting breaking_news is omitted from payload by default - Add test asserting breaking_news is included when provided - Document breaking_news in the Shared Interfaces handoff payload list Resolves review comments on PR #502. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>