fix: restore test_get_runtime_descriptor_keeps_live_lock (no hang)

The skip was based on a false premise. get_runtime_descriptor() does no
locking/waiting: it reads the lockfile and calls os.kill(pid, 0). With a
live pid (os.getpid()) it returns immediately. The full test file passes
in <1s locally, so the test is restored rather than skipped to avoid a
coverage gap on the warm-runtime liveness path.

Co-authored-by: Mervin Praison <[email protected]>

src/praisonai/tests/unit/test_warm_runtime.py

@@ -67,7 +67,6 @@ def test_get_runtime_descriptor_removes_stale_lock():
     assert not get_runtime_lock_path().exists()
 
 
-@pytest.mark.skip(reason="Test hangs indefinitely - needs investigation and proper fix")
 def test_get_runtime_descriptor_keeps_live_lock():
     desc = RuntimeDescriptor(host="127.0.0.1", port=1, token="t", pid=os.getpid())
     desc.write()