Add enterprise SLA uptime monitor

[Colonel-Courtz]

/claim #19

Summary

• Add a distinct enterprise-sla-uptime-monitor Enterprise Tooling slice for SLA, uptime, error-budget, webhook reliability, and export-evidence governance.
• Evaluate synthetic tenant service checks, incidents, webhook delivery outcomes, and export jobs into breached/watch/within-SLA service states.
• Queue admin actions for SLA breach notice, error-budget watch, webhook reliability review, and export holds when evidence references a breached service.
• Include a deterministic SHA-256 evidence digest, requirement map, sample data, tests, and a static SVG demo preview.

Why this slice is distinct

Live gate review found existing #19 submissions for broad enterprise tooling, admin/export foundations, trust center, compliance evidence packets, audit signal routing, webhook replay, identity provisioning drift, retention/legal hold, data residency, and grant portfolio compliance. This submission is limited to SLA/uptime/error-budget governance and does not duplicate those adjacent modules.

Validation

• cd enterprise-sla-uptime-monitor && npm run check
• cd enterprise-sla-uptime-monitor && npm test (5 tests passed)
• cd enterprise-sla-uptime-monitor && npm run demo
• git diff --check
• Secret/prompt-disclosure scan: no matches for token/private-key/seed/platform-instruction patterns

AI-assisted with OpenAI Codex; I reviewed and validated the diff before submitting.