Problem statement

OpenSRE currently lacks a first-class ArgoCD integration. That makes it harder to investigate rollout failures, configuration drift, sync issues, and deployment health in GitOps-driven Kubernetes environments.

Proposed solution

Add a first-class ArgoCD integration that supports:

• onboarding, authentication, and connectivity verification
• reading application status, sync state, health, revision history, and recent changes
• using ArgoCD evidence during investigation planning and root-cause analysis
• surfacing deployment drift and recent rollout context clearly in reports

Acceptance criteria

• the integration is usable from the investigation workflow end to end
• setup and usage are documented clearly
• the implementation is backed by end-to-end tests in tests/e2e or equivalent
• the PR includes a screen video showing setup plus a successful investigation flow using ArgoCD
• vibecoding without testing will not be allowed; PRs without working end-to-end coverage and screen-video proof should be rejected