refactor: define mutation backend interfaces#236

Merged

ako merged 16 commits intomendixlabs:mainfrom

retran:feature/mutation-interfaces

Apr 20, 2026

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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fix: address copilot review — rand.Read error, folder cache bug, IDToBsonBinary dedup
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fix: add type aliases in sdk/mpr for backward compatibility
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fix: optimize UUIDToBlob allocation, sort async map iterations
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fix: use local type aliases in sdk/mpr public signatures
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fix: iterate bytes in UUIDToBlob, use local aliases in tests
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add tests for mdl/types and conversion layer
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fix copilot review comments on json_utils.go
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refactor: define mutation backend interfaces with stub implementations
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fix: set UUID v4 version/variant bits in GenerateDeterministicID
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fix: panic on invalid UUID in IDToBsonBinary, use mpr aliases in convert.go signatures
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docs: fix IDToBsonBinary comment to say UUID string, not hex UUID
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refactor: add typed consts for ContainerKind, InsertPosition, PluggablePropertyOp; add TODO comments in panic stubs
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test: add bsonutil package tests for IDToBsonBinary, BsonBinaryToID, NewIDBsonBinary
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test: add GenerateDeterministicID UUID v4 compliance test
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