[ShadobaDev]

Summary

On Windows, platemaker-cli rejected a folder whose name is not ASCII
(--input "…\Mój katalog" → "is not a directory"), and could not open or
write such files. The CLI built std::filesystem::path from its UTF-8
arguments with the narrow constructor, which MSVC reads in the ANSI code page,
and converted paths back with path::string(). Once the first half was fixed,
the second would have stored ANSI bytes in the workspace JSON.

Every path in cli/main.cpp now goes through utf8ToPath() / pathToUtf8(),
as the library already does:

• --input of process, project create, project mod;
• workspace create, workspace import-profiles --from, template;
• the output folder and stale-output cleanup in process.

The library is unchanged.

Also in this branch: docs/TODO.md drops items that are released or done.

Tests

• New tests/cli-tests/test_non_ascii_paths.py: one end-to-end walk through
  every command above under folders named with ó (in the ANSI code page)
  and 漫 (outside it). It checks exit codes, the files written, and that the
  workspace stores the paths as UTF-8. It fails on main and passes here.
• conftest.py decodes the CLI's text output as UTF-8, which is what the CLI
  writes. The ANSI default on Windows garbled it.
• msvc-debug 393/393, mingw-debug 393/393, linux-debug 429/429.
• Golden render of the reference pages (60 slices) is byte-identical between
  main and this branch. With the fix, it also renders directly from a
  non-ASCII folder.

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