docs: Node compatibility rewrite, version B (lookup)

[bartlomieju]

One of three competing ground-up rewrites of the Node compatibility page,
opened as drafts for side-by-side review; only one will merge. This version
is organized for the reader who arrives asking "is X supported?": it opens
with a working Node HTTP server running under deno, then an at-a-glance
status table mapping all eight compatibility surfaces (built-ins, npm
packages, globals, package.json, CommonJS, node_modules, Node-API addons,
registries) to their state and section, with the Node test-suite stat
beneath it. Each section then leads with a minimal runnable example before
enumerating rules and edges in scannable form. New snippets were executed on
Deno 2.8; the private-registries section, linked anchors, and oldUrl
redirects are unchanged from the fact-checked baseline in #3241. Compare
with version A (#3244) and version C (task recipes).