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Harden input adapter against truncated encoded input (#533)

* Harden input adapter against truncated encoded input

Fix UTF-16 buffer handling so incomplete surrogate pairs cannot underflow the
encoded buffer size, addressing the issue #492 report.

Also reject truncated UTF-8, UTF-16, and UTF-32 input consistently across
iterator, FILE, and stream adapters instead of reading past the end or silently
accepting incomplete encoded data.

Return normalized buffers through the string-based str_view constructor to avoid
constructing a view from an empty iterator range.

Add regression coverage for UTF-16 BOM-only input, dangling UTF-16 surrogates,
and truncated UTF-8/UTF-16/UTF-32 input.

* Handle standalone CR in UTF-16 iterator input

Skip UTF-16 conversion when newline normalization leaves the encoded buffer empty. This prevents valid standalone CR input from being reported as invalid encoding.

* Fix ci_test_clang_tidy (static_cast)

* Exclude defensive UTF-16 guards from coverage

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