feat(discovery): orchestrate match, opt-in filter, dedup, path-check

internal/discovery/docker_client.go

@@ -0,0 +1,15 @@
+package discovery
+
+import (
+	"context"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
+)
+
+// DockerClient is the subset of the Docker SDK we depend on.
+// Defined as an interface so tests can supply a fake.
+type DockerClient interface {
+	ContainerList(ctx context.Context, opts container.ListOptions) ([]types.Container, error)
+	Ping(ctx context.Context) (types.Ping, error)
+}