docs(skills): add grafana_prometheus observability pivot skill

[bearsyankees]

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[greptile-apps]

Greptile Summary

This PR adds a security-testing skill for Grafana and Prometheus observability stacks. The main changes are:

• Reconnaissance and authentication checks for observability services.
• Guidance for validating Grafana CVEs and server-side request pivots.
• Prometheus, Alertmanager, metrics, logs, and traces exposure checks.
• False-positive controls and impact-validation steps.

Confidence Score: 5/5

This looks safe to merge.

• No additional blocking issues qualify in the updated code.

Important Files Changed

Filename	Overview
strix/skills/technologies/grafana_prometheus.md	Adds the Grafana and Prometheus observability pivot skill, including reconnaissance, exploitation, validation, and false-positive guidance.

_{Reviews (3): Last reviewed commit: "docs(skills): fix grafana/prometheus SSR..." | Re-trigger Greptile}

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