beads: ignore the JSONL exports

The Dolt companion is the sync layer for issues and their audit trail, so a
second copy riding in git buys nothing and costs a dirty status after every bd
write. The config half (config.yaml, metadata.json, hooks/) stays tracked, or
there is nothing for bd hooks install to install in a fresh clone.

bd: turn on dolt auto-push

The debounce is 30s rather than the 5m default so a memory or issue written
mid-session reaches dolt.srht.bigb.es without waiting for the session to end,
and the 60s timeout keeps an unreachable remote from hanging bd.

bd: update sync.remote

bd: clear sync.remote

bd init: initialize beads issue tracking