Three build-correctness fixes plus README coverage of the new kernel core.
The Makefile had no header dependency tracking, so editing a header left every
unrebuilt caller linked against the old layout. That is how the desktop's
window paint callbacks silently landed at the wrong struct offset after
gui_window_t grew: gui_apps.o was never recompiled. Compiles now emit .d files
via -MMD -MP and the build pulls them in.
The include has to sit at the end of the file with .DEFAULT_GOAL pinned to
`all` -- a .d file's first rule would otherwise become make's default goal and
turn a bare `make` into a silent no-op.
drivers/video/canvas.c carried the same font table defect gui_gfx.c did: the
`// \` comment on the backslash glyph continues onto the next line, swallowing
the `]` entry and shifting every glyph from ']' onward by one, so all lowercase
text rendered one letter off.
Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01L5yKJT4Wo2cV3rfPrwY5MP
