feat: add deployment foundation and cross-device handoff

internal/preflight/collect_linux_test.go

@@ -0,0 +1,31 @@
+//go:build linux
+
+package preflight
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestRealDiskObservation(t *testing.T) {
+	dir := t.TempDir()
+	if diskAvailable(dir).State != "observed" {
+		t.Fatal("existing filesystem not observed")
+	}
+	if diskAvailable(filepath.Join(dir, "missing")).State != "unknown" {
+		t.Fatal("missing target reported capacity")
+	}
+}
+func TestDanglingResourceLinkRequiresReview(t *testing.T) {
+	dir := t.TempDir()
+	if err := os.MkdirAll(filepath.Join(dir, "var/lib"), 0700); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Symlink("missing", filepath.Join(dir, "var/lib/docker")); err != nil {
+		t.Fatal(err)
+	}
+	if resourceState(os.DirFS(dir), "var/lib/docker") != "present" {
+		t.Fatal("dangling link treated as absent")
+	}
+}