toomuchdesign / json-schema-fns / 26313573779

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feat: preserve if/then/else conditionals and extend JSONSchemaType (#199)

## What kind of change does this PR introduce?

Bug fix + feature

## What is the current behaviour?

`sealSchemaDeep` / `unsealSchemaDeep` were mutating `if` / `then` /
`else` sub-schemas, silently changing which values triggered each
branch.

## What is the new behaviour?

Add the three keywords to the skip dispatch (runtime + type), mirroring
`not`.

Widen the top-level `type` field to `JSONSchemaType | readonly
JSONSchemaType[]` so schemas like `type: ['object', 'null']` are
accepted at the input boundary (previously rejected with TS2345).
`JSONSchemaObject` still requires the literal `'object'` form, so
object-shaped functions are unaffected.

## Does this PR introduce a breaking change?

No

## Other information:

## Please check if the PR fulfills these requirements:

- [X] Tests for the changes have been added
- [X] Docs have been added / updated
- [X] Relevant
[Changeset](https://github.com/changesets/changesets/blob/main/docs/adding-a-changeset.md)
has been added

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Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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