Schema migration system for ZIO Schema 2#998

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Godzilla675 wants to merge 22 commits intozio:mainfrom

Godzilla675:schema-migration-for-zio-schema-2-system-v3

Commits on Feb 5, 2026

Commits on Feb 6, 2026

Add 413 migration coverage tests to meet 80% branch coverage minimum
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Fix scalafmt formatting for MigrationBuilderSyntax.scala
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fix: scalafmt scala213 dialect, fix failing test, add coverage tests for branch gap
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fix: JS compat, coercion assertions, add modifyAtPathRec and navigate coverage
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fix: add targeted branch coverage tests for 3.3.x threshold
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Address code review feedback
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Revert TransformValue context change - transform must eval against field value, not parent
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Polish migration docs: fix method names, add descriptions, improve examples and error table
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feat: add compile-time field tracking via TrackedMigrationBuilder (Scala 3)
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docs: add compile-time field tracking section to migration reference
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refactor: remove ~30 duplicate tests across coverage spec files
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fix: resolve 7 bugs in migration system
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Commits on Feb 7, 2026

fix: address PR audit - ChangeType, Join/Split validation
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