Loading a legacy file (flag, env, or cwd-found — never on defaults) emits
one stderr block listing each key actually present with its destination
from RFC-008's migration map — the map applied to YOUR file, not a
generic banner. Once per process; both binaries warn (cluster-mode boots
never reach load_config, silent by construction); suppressible via
OMNIGRAPH_SUPPRESS_YAML_DEPRECATION=1 for CI logs during the window.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>