ElyMark: a press in a table opens its cell alone (component 2594b3f)

Visual mode opened a pressed table whole, as Markdown source. The
component now opens only the pressed cell, in place, as its source;
Tab, Shift-Tab and the arrows walk the cells, Enter and Escape write
back in one undo step, a typed bare pipe is escaped. Adds the R6
checklist for the 0.1.5 re-release.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

scripts/fetch-references.sh

@@ -36,7 +36,7 @@ fetch() { # name url rev [sparse paths...]
   echo "fetch $name $rev"
 }
 
-fetch Ely-GPUI-Components https://git.zacharyzhang.com/ZacharyZhang-NY/Ely-GPUI-Components.git 2b8bd9fcf3ab94a3399ca70bfaf0a6764291f5ec
+fetch Ely-GPUI-Components https://git.zacharyzhang.com/ZacharyZhang-NY/Ely-GPUI-Components.git 2594b3fd0fd0302840d38e01b151fda356b8c5e6
 fetch zed https://github.com/zed-industries/zed.git 1a28cff4b409169bac058bca40dfbfeb7621d19b
 fetch libreoffice-core https://github.com/LibreOffice/core.git 8221e31b3ac356a1623c672912a3d2b492f7e3d1 \
   include/LibreOfficeKit libreofficekit desktop/source/lib desktop/inc \