There is no `rad push`/`rad pull` subcommand -- `rad`'s actual
subcommand set is auth/checkout/clone/.../sync/watch (see `rad
--help`); pushing/pulling git refs (branch, notes) is done via plain
`git push rad`/`git pull rad`, same as any git remote. LFS-IPFS.md's
"Use" section and `rad lfs init`'s own printed success message both
said `rad push`/`rad pull`, which doesn't exist and doesn't even
gesture at the real push gotcha (branch and notes ref need two
separate pushes).
Also updates LFS-IPFS.md's "How it works" section, which still
described the pre-batching design (a pre-commit hook calling `rad lfs
store` once per file, and the bare `refs/notes/rad-lfs` as if it were
the local write target) -- both stale since the LOCAL_NOTES_REF fix
and the `rad lfs precommit` batching added this session. `rad lfs
init`'s own success message now proactively states the push gotcha,
rather than only documenting it after the fact in Troubleshooting.
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