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Stage1Model, Stage2OneShot and Stage2Autoregressive each independently implemented ~90 near-identical lines of __init__ scaffolding: build-or-share cond_enc, particle_type_cfg normalisation, objective -> time_emb -> merged_cond_dim -> build_trunk, and the n_sec_head/type_head classifier heads (plus their identical RuntimeError guards). Now unblocked by #33 (trunk registry), #34 (block-conditioning registry) and #36 (build_mlp_head), which settled what belongs in the shared base. Adds StageModel(nn.Module) owning all of that: __init__ builds/shares cond_enc and normalises particle_type_cfg; _build_trunk_and_heads, called by each subclass after it sets up its own conditioning-assembly modules (cond_enc alone for Stage1Model, a context-fusion path for the two Stage2 classes), builds the objective/time embedding/trunk and the n_sec_head/type_head guarded by the shared _require_n_sec_head/ _require_type_head (Stage1Model overrides the n_sec guard since its message points at stage 2, not stage 1). Public __init__ signatures, attribute names, and forward/predict_* behaviour are unchanged. Verified with a pre/post state_dict-key-set diff against the pre-refactor classes (bit-identical) before writing this commit, plus new parametrized tests pinning each class's state_dict key set and the generator -> time_emb contract the base now owns. tests/test_migration_ v02_v03.py's existing bit-identical old-vs-new forward comparison and the rest of tests/test_network.py's per-class coverage pass unchanged. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>