Adds scripts/make/help.sh which parses the Makefile, joins comment
lines preceding each target as its description, and tails the listing
with a pointer to `infinito --help` (or `python -m cli --help` when
the console script is absent) plus a link to https://docs.infinito.nexus.
The CLI's global help now references `make help` and the docs site.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>