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281333e0 - Drop loop_* declaration properties; validate sub-blocks at construction

Drop loop_* declaration properties; validate sub-blocks at construction Remove loop_inputs / loop_intermediate_outputs / loop_expected_components / loop_expected_configs from IterativePipelineBlocks — when the loop logic in __call__ consumes inputs or components beyond what sub-blocks declare, the subclass overrides the aggregated inputs / expected_components properties directly (see Flux2DenoiseLoopWrapper). Sub-block validation (type + loop-variable signature) now runs at construction (__init__ and from_blocks_dict) instead of lazily in loop_step. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>