Create a new Harness FME feature flag and its per-environment definitions with a safe default, following the project's naming and tagging conventions. Use when asked to create a feature flag, add a flag, set up a new FME flag, or initialize flag targeting. Flag/definition writes only: does not gate application code (instrument-feature-flag) and is not a first-time onboarding entry point (feature-flag-onboarding). Do not use for updating existing flag targeting (update-flag-targeting), deep analysis of a single flag (explain-flag), listing/discovering flags (discover-feature-flags), flag lifecycle like archive/delete (manage-flag-lifecycle), segments (manage-segments), experiments (manage-experiments), pipeline rollouts (fme-pipeline), or removing flags from code (cleanup-feature-flags). Trigger phrases: create feature flag, add flag, new flag, set up flag, FME flag create, initialize flag.