Local dev runs with the SQLite backend leave `wfe.db{,-shm,-wal}` files
in the repo root, and `workflows.schema.yaml` is a generated artifact
we prefer to fetch from the running server's `/schema/workflow.yaml`
endpoint rather than checking in.
Workspace with 6 crates: wfe-core, wfe-sqlite, wfe-postgres,
wfe-opensearch, wfe-valkey, and wfe (umbrella). Nextest profiles
for default, integration, and CI. Docker compose for PostgreSQL,
Valkey, and OpenSearch integration tests.
