Extract shared types and mutation backends from sdk/mpr#233

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retran wants to merge 6 commits intomendixlabs:mainfrom

retran:feature/shared-types

Commits on Apr 19, 2026

feat: add comprehensive mock-based handler tests (189 tests, 33 files)
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refactor: extract shared types and utility functions to mdl/types
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refactor: define mutation backend interfaces with stub implementations
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refactor: implement mutation backends and migrate handlers off sdk/mpr
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refactor: decouple executor from storage layer, extract remaining BSON
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refactor: improve code quality — deterministic output, doc comments, naming consistency
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