Draft Generation Workflow

Users with agent_drafts.manage can generate workflow drafts from /dashboard/agent-drafts.

Generation flow:

1. Check agent and Sprint 17/Sprint 18 guardrails.
2. Read source-linked local context.
3. Create an AgentRun.
4. Create AgentRunStep records for guardrail check, context read, draft generation, and proposal creation.
5. Create an AgentActionProposal with autoExecute: false.
6. Create an AgentWorkflowDraft.
7. Create initial AgentWorkflowDraftVersion.
8. Create an activity log.

The source record is never mutated during generation.