* fix: tagged directives should be applied to tagged mental models
* test: add unit test for based_on structure
Verify that reflect returns the correct based_on structure with:
- directives as dicts (id, name, content) in based_on.directives
- mental models as MemoryFact objects in based_on.mental-models
- memories separated properly
This ensures directives and mental models are not mixed together
in the API response.
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