Update mcp tool universe

Add rag utility

test-data/docs/units_manual.md

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+# Working with Units
+
+The DSL strictly types physical units to prevent conversion errors between OTX and ODX.
+
+## Defining a Unit
+Use the `Unit` keyword followed by the display symbol.
+
+Example:
+`Unit Speed [km/h]`
+
+## Common Errors
+Never use string literals for units in a `DiagnosticService`. Always reference the typed Unit definition.