📦🔧：align validators with runtime checks

[DerekNonGeneric]

Several guards and helpers promised types their runtime checks did not prove.
That let strict TypeScript programs compile calls which then failed at runtime,
including unchecked array elements, equality matches, invalid dates, shallow
iterators, open-ended interfaces, and map() results.

This change:

• leaves unchecked array and array-like elements as unknown;
• makes shallow iterator and equality checks boolean validators;
• adds branded valid-date and well-formed-string refinements;
• restricts hasInterface to finite property interfaces and checks inherited
  validator declarations;
• describes map()'s one-level flattening in its return type; and
• adds strict compile-time and runtime regressions for every contract.

Fixes #99.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8177c45 and a64d68a.

📒 Files selected for processing (19)

• .changeset/sound-validation-types.md
• packages/assert/src/guards/is-deep-equal-to.ts
• packages/assert/src/guards/is-equal-to.ts
• packages/assert/src/guards/is-identical-to.ts
• packages/assert/test/guards/equality-types.ts
• packages/util-array/src/guards/is-array-like.ts
• packages/util-array/src/helpers/map.ts
• packages/util-array/test/guards/is-array-like.ts
• packages/util-array/test/helpers/map.ts
• packages/util-core/src/guards/has-interface.ts
• packages/util-core/src/guards/is-array.ts
• packages/util-core/test/guards/has-interface.ts
• packages/util-core/test/guards/is-array.ts
• packages/util-date/src/guards/is-valid-date.ts
• packages/util-date/test/guards/is-valid-date.ts
• packages/util-string/src/guards/is-well-formed-string.ts
• packages/util-string/test/guards/is-well-formed-string.ts
• packages/util-types/src/guards/is-iterator.ts
• packages/util-types/test/guards/is-iterator.ts

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[DerekNonGeneric]

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Pull request is closed.