Render auto-width grid children at their resolved track widths before resolving row heights. This keeps wrapped content visible and prevents stale intrinsic heights from clipping the final line.
Verification: make grid-tests EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs; make compile EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs; make check EMACS=/Applications/Emacs.app/Contents/MacOS/Emacs.
Measure auto-width children intrinsically, constrain them to resolved tracks, account for border-box wrapper content, and align every rendered line before painting the wrapper border.
Split the verified renderer, layout engine, Grid support, native boundary, tests, examples, and paired documentation into the independent Ebox repository. Keep ETAF and application concerns outside this package.
