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SNAP Negative core files

Program types, calculation, field codes, validation and policy. These functions are shared by client previews and server commands.

System explanation · Choosing checks

Source files

File	Responsibility / entry points
`src/programs/snap-negative/calculation.ts`	Versioned benefit formula, self-employment totals, proration, income combining and Final selection. calculate, prorateBenefit, combineIncome, selectFinal, selfEmploymentTotals
`src/programs/snap-negative/constants.ts`	Synthetic baseline month, review number, numeric seed and reference-date constants. DEMO_REVIEW_NUMBER, DEMO_SAMPLE_MONTH, DEMO_GENERATOR_SEED, DEMO_BASELINE_PER_MONTH, DEMO_BASELINE_AS_OF
`src/programs/snap-negative/field-catalog.ts`	Workbook field labels/codes, required sets, answer normalization and element/nature validation. FieldDefinition, FieldChoice, reviewFieldDefinitions, reviewFieldByKey, elementCodeChoices, natureChoicesForElement …
`src/programs/snap-negative/input-limits.ts`	Shared money, household, income-row and date/month bounds. MIN_HOUSEHOLD_SIZE, MAX_HOUSEHOLD_SIZE, MAX_INCOME_ROWS, MAX_MONEY_CENTS, isCalendarDate, isCalendarMonth
`src/programs/snap-negative/nature-catalog.json`	Element/nature choice data consumed by the field catalog.
`src/programs/snap-negative/policy.ts`	Policy types/default tables, effective-month selection and saved-copy resolution. demoPolicy, expandedDemoPolicy, SnapPolicy, initialPolicy, policyForMonth, resolveReviewPolicy
`src/programs/snap-negative/review-template.ts`	Lightweight import/loading and reset templates used by application code. createImportTemplate, demoScenarioTemplate, createDemoReviewTemplate
`src/programs/snap-negative/rule-versions.ts`	Supported immutable calculation/check IDs and unknown-version rejection. LEGACY_CALC_VERSION, LEGACY_CHECK_VERSION, PREVIOUS_CALC_VERSION, EDUCATION_CALC_VERSION, CURRENT_CALC_VERSION, PREVIOUS_CHECK_VERSION …
`src/programs/snap-negative/types.ts`	SNAP-specific review facts, scenarios, income, answers and calculation results. ScenarioId, HouseholdMember, IncomeStream, SuaType, Scenario, ComputationResult …
`src/programs/snap-negative/validation.ts`	Versioned required-input blockers, stored edit-check findings and current/stale predicates. validateRequiredInput, runFullEditCheck, validateReview, activeStoredFindings, hasOpenStoredFindings, requiredInputComplete …

Tests

File	Responsibility / entry points
`src/programs/snap-negative/calculation.test.ts`	Checks calculation. Example: “ordinary monthly workbook snapshot”.
`src/programs/snap-negative/input-limits.test.ts`	Checks input limits. Example: “scenario and roster limits agree at 1 and 20, with zero reserved for unpopulated drafts”.
`src/programs/snap-negative/policy.test.ts`	Checks policy. Example: “dated rows select by sample month and retain the saved review table”.
`src/programs/snap-negative/rule-versions.test.ts`	Checks rule versions. Example: “review rule bindings”.
`src/programs/snap-negative/validation.test.ts`	Checks validation. Example: “field catalog”.