Fix panic when context window falls on multibyte char boundary#748
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`compute_context_window` sliced `source[start..end]` using byte offsets derived from `sym_start - half` / `sym_end + half`, which can land in the middle of a multibyte UTF-8 character (e.g. Cyrillic 'о'). Snap all computed indices to the nearest char boundary before slicing. Fixes #747
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compute_context_windowslicedsource[start..end]using byte offsetsderived from
sym_start - half/sym_end + half, which can land inthe middle of a multibyte UTF-8 character (e.g. Cyrillic 'о').
Snap all computed indices to the nearest char boundary before slicing.
Fixes #747