tools: add wibo

[maci0]

Adds tools/wibo.md, documenting the minimal Win32 loader decomp.me uses to run Windows compilers faster than Wine.

The page covers, in the style of the existing tool pages (tools/maspsx.md, tools/decomp-dev.md):

• Why wibo instead of wine — wine server startup + prefix initialization vs a direct PE load; the speed win for the plain console tools decompilation uses.
• How it works — PE loading, WinAPI shims targeting pre-XP behavior, embedded Wine CRT DLL builds (encounter/winedll, per-ABI versions), stub-pointers-for-unknown-imports behavior.
• Usage — CLI options (-C chdir, --cmdline, path subcommand, WIBO_DEBUG).
• Limitations — the concrete GetThreadLocale gap that breaks bcc32 (verified), with the fall-back-to-wine guidance.
• Getting wibo — static release binaries (i686/x86_64/macos) and the cmake build.
• Integration — REBREW_RUNNER=wibo in the rebrew-toolchains docker images; decomp.me.
• Related — taviso/loadlibrary (inspiration), retrowin32, licensing note.

Facts are sourced from the decompals/wibo README/AGENTS and this session's verification runs.