docs(TSP-1087): Add Alarm System CRUD API documentation

[claude]

Summary

• Creates new page build/agents/build-your-agent/evals/alarm-system-api.mdx documenting the Alarm System CRUD API for threshold-based evaluation metric monitoring
• Updates evals.mdx to reference the Alarm System API from the Performance section
• Updates alerts.mdx to distinguish alert rules (task events) from evaluation alarms (metric thresholds)
• Updates sdk-and-api-triggers.mdx to cross-link to the Alarm System API
• Updates docs.json to add the new page under an Evals navigation group

Key messaging

• CRUD only — alarm scheduling and notification delivery are coming in a future release; this is made very clear with a prominent Warning callout
• Evaluation metric thresholds, not agent task events (which are covered by alert rules)
• API-first with cURL, JavaScript, and Python examples for all CRUD operations
• Scoping to specific agents or workforces
• Notification channels: email, Slack, Teams

Test plan

• Verify all internal links resolve
• Verify new page appears in sidebar under the Evals group
• Verify all headings are sentence case
• Verify no banned words

Linear

https://linear.app/relevance/issue/TSP-1087/

🤖 Generated with Claude Code

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[linear]

TSP-1087 [Frontend] PR #12730: Alarm System evaluation monitoring docs