Add Diagnostic Bridge

[mfaferek93]

Summary

Convert /diagnostics messages to faults for backwards compatibility.

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Proposed solution (optional)

Bridge node:

Subscribe /diagnostics
Convert DiagnosticStatus → ReportFault
Configurable mappings

Configuration:

diagnostic_bridge:
  level_mapping:
    ERROR: 2
    WARN: 1
  name_to_code:
    "motor_controller: Status": "MOTOR_001"

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Additional context (optional)

Any extra details, links, screenshots, etc.