[Feature] Add remaining error budget percentage display

[gr1m0h]

Priority

Medium

Description

Display remaining error budget percentage in addition to consumed error budget to provide immediate visibility into available error budget.

Use case

• Immediate visibility into remaining error budget
• Threshold-based alerting configuration
• Risk assessment for deployments
• Stakeholder communication and reporting

Proposed solution

Extend current output to include remaining budget information:

Current output (assumed):

Error Budget Consumed: 25.5%

Proposed output:

Error Budget Consumed: 25.5%
Error Budget Remaining: 74.5%

Implementation considerations

• Ensure mathematical consistency (consumed + remaining = 100%)
• Consider precision and rounding
• Maintain existing output format compatibility

Additional context