feat(core): add discriminated union (sum type) support#76

Draft

typedrat wants to merge 17 commits intoloro-dev:mainfrom

synapdeck:feat/discriminated-unions

Commits on Apr 9, 2026

feat(core): add LoroUnionSchema type and inference helpers
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feat(core): add schema.Union builder
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feat(core): add union validation, type guard, and default value support
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feat(core): add union diff system and mirror container registration
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test(core): add comprehensive edge case tests for discriminated unions
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docs: add schema.Union to API reference and README documentation
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fix(core): allow defineCidProperty to overwrite stale user-set $cid
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fix(core): use post-mutation index for union variant-switch in list diff
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fix(core): merge initialState data into union fields instead of discarding it
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fix(core): address code review issues for discriminated unions (#76)
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fix(core): resolve build errors from rebase
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fix(core): handle loro-union in schema resolver
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fix(core): decode transforms for loro-union in decodeNestedJsonValues
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fix(core): resolve union variants in containerToMirrorState
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fix(core): register root container schemas before initial snapshot
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fix(core): persist initialState map primitives to LoroDoc for ephemeral routing
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test(core): add coverage for transforms in union variants and MovableList of unions
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