Monorepo for Tangled tangled.org

knot: use `git.refs` #4590

Closed boltless.me
targeting sv-fe
Closed opened by and assigned to boltless.me
targeting sv-fe

The format is basically same as packed-refs, so easier to work with.

per-ref records sh.tangled.git.ref remains, but I'd like to remove them in flavor of ls-refs and jetstream gitPush events.

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