feat: Add Argo Workflows job agent integration

[jsbroks]

Discussed in #776

^{Originally posted by cursor[bot] February 4, 2026}

Summary

Add a job agent integration that runs Ctrlplane jobs as Argo Workflows.

Problem

Teams already orchestrate workloads with Argo Workflows and want Ctrlplane jobs to trigger and monitor workflows directly instead of relying on custom glue.

Proposal

• Introduce a new job agent type (e.g. argo-workflows).
• Create workflows from Ctrlplane job definitions using either:
  • A referenced WorkflowTemplate
  • Or an inline Workflow manifest
• Map Ctrlplane job lifecycle to Argo workflow status (Pending/Running/Succeeded/Failed).
• Support parameter/variable injection, retries, and cancellation (terminate workflow).
• Surface workflow links, logs, and artifacts in job metadata.

Scope / tasks

• Define configuration schema and validation.
• Implement integration package + API wiring.
• UI selection + configuration form.
• Observability: events/metrics and links to Argo UI.
• Add integration/e2e tests.
• Documentation and example config.

Acceptance criteria

• Jobs create Argo workflows and update status reliably.
• Cancellation terminates the workflow.
• Parameters and secrets map correctly.
• Clear docs and tested happy-path + failure-path.