L6 Engagement Engine v5.18.0: Hardware Health Guardian & Telemetry Parity

[dcplatforms]

This PR implements the June 2026 weekly mission for the L6 Engagement Engine (v5.18.0).

Key Changes:

• Hardware-Aware Gamification: Introduced the Hardware Health Guardian achievement, rewarding drivers who utilize reliable grid segments (zero regional alarms, fetched from L4 via Redis).
• Telemetry Standardization: Implemented the safeFloat utility to ensure all physics and confidence scores are formatted as 4-decimal strings, satisfying the requirements for Phase 6 L11 ML Engine training data parity.
• Cross-Layer Metadata: Enriched Kafka events and push notifications with site-specific and regional alarm context.
• Platform Sync: Updated PLATFORM_STATUS.md and MASTER_BACKLOG.md to reflect the June 2026 engineering status and the transition to hardware-aware resilience.

Verification:

• Successfully ran npm test in services/06-engagement-engine/.
• All 31 tests passed, including new verification for safeFloat and achievement triggers.
• Verified document integrity and version synchronization across the monorepo.

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PR created automatically by Jules for task 3808781265047990032 started by @dcplatforms

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