sprig 0.2.0

[fergousA]

I am submitting

• a new package
• an update for a package

Description:

• Stacked layouts — new layout: on mindmap: "both", "right", "left", "down", "up"; cards size to their content, leaf-width/child-width/width only cap the maximum — no more split words.
• blossom — text now centered in each petal; new length: sets petal radial length; numbering uses Western digits by default even under RTL, can be hidden (false) or replaced with a symbol array (("★", "✿", …)), a pattern or a function.
• Docs — guide and README updated (petal demo, layout demos, reference entries); RTL numbering direction corrected (clockwise, 02 on the right).