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This adds `line_get_slice` and `eb_get_line_slice`, enabling
slice-style (pointer + length) access to line contents without
requiring materialization into a null-terminated string.
- `line_get_slice` returns either the original mmap'd buffer (if the
- line is lazy) or the materialized vector contents (if edited).
- `eb_get_line_slice` wraps `line_get_slice` to provide safe access at
- the editor buffer level. Update `line.h` and `editor.h` headers to
- declare the new functions. Minor documentation improvements to
- clarify "init", "modify", and "get" function categories.
This prepares the codebase for transitioning away from C-string
dependency where possible, improving efficiency and avoiding
unnecessary memory copies.
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