tests: Run composefs oci pull test on composefs systems

The cfs oci pull command already calls prepare_for_write() via
get_storage() -> get_locked_sysroot(), so it has write access to
sysroot even on composefs systems. Remove the conditional that was
skipping the test.

Assisted-by: Claude Code (Sonnet 4.5)

Author: cgwalters

tmt/tests/booted/readonly/030-test-composefs.nu

@@ -7,16 +7,14 @@ tap begin "composefs integration smoke test"
 let st = bootc status --json | from json
 let is_composefs = ($st.status.booted.composefs? != null)
 
-if $is_composefs {
-    # When already on composefs, we can only test read-only operations
-    print "# TODO composefs: skipping pull test - cfs oci pull requires write access to sysroot"
-    bootc internals cfs --help
-} else {
+if not $is_composefs {
     # When not on composefs, run the full test including initialization
     bootc internals test-composefs
-    bootc internals cfs --help
-    bootc internals cfs oci pull docker://busybox busybox
-    test -L /sysroot/composefs/streams/refs/busybox
 }
 
+# These tests work on both composefs and non-composefs systems
+bootc internals cfs --help
+bootc internals cfs oci pull docker://busybox busybox
+test -L /sysroot/composefs/streams/refs/busybox
+
 tap ok