Hub.fossil opens in WAL journal mode, so without checkpointing the on-disk file stays as a 4 KiB stub plus a multi-hundred-KiB *-wal sidecar — vanilla fossil tooling (fossil ui / fossil info / fossil timeline) refuses it because its validity probe stats the main file before consulting the WAL.

Wire a goroutine in NewHub that runs PRAGMA wal_checkpoint(PASSIVE) every Config.CheckpointInterval (default 10s) so vanilla fossil can always read hub.fossil while the hub is running. PASSIVE never blocks readers or writers. Hub.Stop drains the goroutine before closing the libfossil handle; libfossil v0.6.0's own (*Repo).Close runs a TRUNCATE checkpoint, so the post-Stop on-disk file is self-contained.

Closes #143. Bumps libfossil v0.5.0 → v0.6.0 (danmestas/libfossil#28). check-in: 72cfc528b2 user: [email protected] tags: trunk, v0.0.14