* replica: extract single-writer election to hanzoai/ha
Election (Owner/IsOwner/Replicas/Member) was storage-agnostic pure Go with
zero vfs-internal callers — it lived here only historically. It is now its
own coordination primitive at github.com/hanzoai/ha so any singleton (cron,
queue drain, billing sweep) gets exactly-once WITHOUT importing a SQLite
library. vfs/replica keeps what it is: SQLite replication (Replicator,
SQLiteDB, BackendStore). One concern per package.
Consumers (visor, cloud/internal/org) migrate to hanzoai/ha in lockstep;
they pin vfs v0.6.2 so this main-only removal does not disturb them until
they bump. Removes owner.go + its two election tests; doc points at ha.
* ci: enable cgo for the -race steps (pre-existing red)
go test -race requires cgo, but the self-hosted hanzo-build-linux-amd64
runner has no C compiler and defaulted CGO_ENABLED=0 (vfs is CGO-free in
production), so both race steps failed — first with 'go: -race requires
cgo', then 'C compiler gcc not found'. Every main run has been red on this
for many commits. Fix: install gcc + set CGO_ENABLED=1 on the two -race
steps only; the production build stays CGO_ENABLED=0. Now the race detector
actually runs (real coverage for the concurrent replicator/ship loops).
Unrelated to the ha extraction but folded in so this PR lands green rather
than override a known-bad check.
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Co-authored-by: hanzo <z@hanzo.ai>
