Declare exact choices for legacy configs

[AlexanderFengler]

Depends on #337.

Why

Five built-in model configs declared only a choice count, not their exact response labels. The legacy HSSM wrapper therefore used its three-label fallback. That happened to match four models, but incorrectly exposed the four-choice tradeoff_weibull_no_bias model as supporting only [0, 1, 2].

Scope

• declare [0, 1, 2] for the four three-choice configs
• declare [0, 1, 2, 3] for tradeoff_weibull_no_bias
• verify each declaration against simulator-owned possible_choices metadata and observed outputs
• verify the exact labels reach the unchanged three-value HSSM simulator contract

This is a standalone config correction. It does not yet classify observation schemas or change simulator output.

Verification

• focused config and HSSM-support suite: 106 passed
• simulator, class, and dataset-integration regression slice passed
• HSSM test_make_hssm_rv passed with candidate ssms provenance confirmed
• repository-wide Ruff check and format check passed
• git diff --check

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
unittests	94.33% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
ssms/config/_modelconfig/dev_rlwm_lba.py	100.00% <ø> (ø)
ssms/config/_modelconfig/lba.py	100.00% <ø> (ø)
ssms/config/_modelconfig/lca.py	100.00% <ø> (ø)
ssms/config/_modelconfig/tradeoff.py	100.00% <ø> (ø)

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