MiGrid Platform v10.1.5 Documentation Update

[dcplatforms]

This update conduct a master platform review and synchronizes the MiGrid documentation stack with the transition to v10.1.5.

Key updates include:

1. Strategic Alignment: Updated PLATFORM_STATUS.md and MASTER_BACKLOG.md to reflect the successful completion of Phase 5 ("Enterprise Scale") and the active state of Phase 6 ("AI & Optimization").
2. Version Parity: Incremented service versions for L1, L2, L3, L4, L6, L7, L10, and L11 based on current engineering outputs.
3. Resilience & Parity: Documented the deployment of localSafetyCache (L1/L7) and strict Phase 6 telemetry parity (4-decimal string formatting).
4. Visual Synchronization: Updated the interactive roadmap and architecture documentation to match the system's current reality, verified via Playwright screenshots.
5. Backlog Grooming: Refined the Priority Path and Cross-Layer Dependency Matrix for L11 ML Engine forecasting (now at 50% completion).

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PR created automatically by Jules for task 1829500321336397068 started by @dcplatforms

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