L2 Grid Signal v2.5.5: Site-Specific Safety Isolation & Platform v10.1.6 Sync

[dcplatforms]

This update synchronizes L2 Grid Signal with Platform v10.1.6 standards and implements site-specific safety isolation. Key changes include:

• Refactored L2 logic to version 2.5.5.
• Implemented localSafetyCache.site_safety for sub-millisecond site-level dispatch rejection.
• Updated Kafka consumer to trigger 900s site-specific safety locks upon receiving CRITICAL DER alarms.
• Enhanced Redis polling to synchronize site-level locks via SCAN.
• Synchronized PLATFORM_STATUS.md and MASTER_BACKLOG.md to June 2026 / v10.1.6.
• Added comprehensive unit tests in v2_5_5_logic.test.js.
• Generated L2 Weekly Engineering Report.

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PR created automatically by Jules for task 16817954925433216212 started by @dcplatforms

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