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feat(api): explicit factor pinning for Sobol — fixed values (T53xx) → 0.1.0a9 - #51
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…ocabulary (T53xx) V26dd made the Sobol box domain-only, but the domain vocabulary had no way to FREEZE a factor at a caller-stated value: constants existed only as auto-inferred columns (constant in the samples). A consumer holding a "pin this variable" UX (mmux_vite's Sobol panel migration) otherwise has no faithful mapping — reusing a distribution's `constant` param is exactly the conflation V26dd retires, a degenerate DomainSpec is V47st-rejected, and pinning the caller's samples would silently change the surrogate fit. - evaluate_sobol / SumoSession.sobol gain fixed: Mapping[str, float]: unknown names rejected, boxed∧fixed overlap per variable rejected, values guarded finite ∧ log-positive; the surrogate keeps the factor's real spread (pin applies to the sampling design only — legacy semantics) - SobolResult.fixed now echoes explicit pins beside auto-inferred constants (inspectable, V21pf) - SPEC: V26dd clause (explicit freeze ! fixed-value domain vocabulary), T53xx; V&V I11 extended - version 0.1.0a8 -> 0.1.0a9 Co-Authored-By: Qwen3.8 Flash Next NVFP4 (AWS vLLM) <noreply@anthropic.com>
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Small V26dd companion: the domain vocabulary could auto-pin columns constant in the samples but had no way to FREEZE a factor at a caller-stated value. mmux_vite's Sobol-panel migration needs exactly that (reusing a distribution 'constant' param = the conflation V26dd retires; degenerate DomainSpec = V47st-rejected; pinning caller samples = silently changes the surrogate fit).