Daily error-budget statement spanning both domains

[CodeBuildder]

Context

Daily report combining SLO error budget consumption from both reliability and security events. Parent: #42.

Acceptance Criteria

• Report generated daily at configurable time (default 08:00 UTC)
• Report includes budget consumed by: chaos experiments, incidents, policy enforcement actions
• Budget breakdown per service with source attribution (which events consumed budget)
• Report queryable via GET /reports/daily?date=YYYY-MM-DD

Dependencies

Blocked by: none | Blocks: none

Notes

No model tier.