feat: add campaigns

[mnkiefer]

Add Campaigns

• Bring in the (enterprise) concept of campaigns: , which are agentic workflows that enable AI agents to orchestrate focused, time-bounded initiatives by automatically creating project boards, generating tasks, and tracking progress across issues and pull requests.
  • Update main workflow schema to add the update-project safe output, enabling smart management of GitHub Projects (v2) boards, including creation, item addition, and field updates.
  • Add Bug bash to provide agentic example for running bug bashes.
  • Add section to docs detailing campaign workflows, campaign IDs, orchestration patterns, integration with worker workflows, and best practices for planning, execution, and tracking.