Phase A1: Minimum viable proof

First release of the IODS framework reference implementation.

Phase A1 deliverables:

• Magnitude function M_m(t,e,s) with sigmoid and softmax variants
• Modality-specific encoders (DNA Transformer, image CNN, audio CNN, TCN, MLPs)
• Cross-attention fusion with modality-presence indicators
• Forward (heteroskedastic) and inverse (k-mer / marker / Pfam) prediction heads
• Phylogenetic null models (TaxonomicMean, NearestNeighbour, BrownianMotion)
• C1 / C2 / C3 condition evaluators
• 44 unit and integration tests, all passing
• Quickstart demo runnable as python -m iods.demo

Implements formulas F1, F2, F3, F6, F7 of the formalization paper.
F4 (GAT), F5 (planetary), F8/F9 (round-robin) deferred to Phase A2.

See docs/paper_to_code_map.md for the section-by-section mapping.