The forward signature now accepts r_timestep as an explicit kwarg (not
silently swallowed by **kwargs), gets flattened in parallel with timestep
when the input is 2-D (Wan 2.2 ti2v case), and is forwarded to the
condition_embedder.
The constructor now propagates the four arch_config flags
(r_embedder/r_embedder_fusion/r_embedder_gate_value/r_embedder_deltatime_type)
into the WanTimeTextImageEmbedding so a YAML can opt into AnyFlow's
dual-timestep conditioning through training.dit_config overrides.
Defaults preserve byte-identity with the legacy single-timestep path —
when r_timestep is omitted the delta_embedder branch is skipped entirely
(test_embedder_enabled_without_r_timestep_is_bit_identical_to_legacy).
Enderfga
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