Add 680px breakpoint to toolsntoys, foss-tools, guides, jl-early-tools:
header stacks, stats bar collapses to 2-col, sidebar/content grid stacks.
Fix table overflow in 3 guide pages: move overflow-x:hidden from body to
.guide-wrap so .guide-table-wrap scroll containers work on mobile Safari.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Move 6 guide pages from Guides/ to ToolsnToys/ root; fix back-links.
Add edu-toys.html (museum-style iframe exhibit for 4 legacy edu toy pages).
Add 4 edu toy artifacts, dendritic curio, docker-cheatsheet-enhanced.
Wire foss-tools, guides, edu-toys, and dendritic hrefs in toolsntoys.html.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
