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Author	SHA1	Message	Date
Shay	4ddaef4d00	feat(constraint): two-category reader — prose to ConstraintProblem (R2 C5-C9) generate/constraint_comprehension/reader.py: read_constraint_problem comprehends two-category constraint prose into a typed ConstraintProblem via five recognizers — C5 category-pair (from coefficient clauses; >2 -> too_many_categories), C6 coefficient (Each <cat> holds/has/costs/is-worth <N> <unit>; shared measured unit), C7 total-count (collective-unit sentence -> x+y=N; absent -> missing_total_count), C8 weighted-total (measured-unit sentence -> ax+by=T; absent -> missing_weighted_total), C9 query-target (How many <cat> -> the asked unknown). Refuses, never mis-assembles. Reconciles the sketch's 'no equal coefficients' note: equal coefficients are a SOLVER refusal (indistinguishable_weights), not a reader one — the reader reads r2-010 setup_correct and the solver refuses it. run_reader lane + 'reader' CLI subcommand. R2 reader: setup_correct 10 / setup_wrong 0 / refused_correct 3; R1 7/0/3 and 15-case 15/0/0 unchanged. Off-serving. 8 reader tests incl. full read->solve->verify chain + meaningful-fail guards.	2026-06-07 07:34:55 -07:00
Shay	babcf2fdb2	feat(constraint): exact integer 2-var solver — Cramer's rule, refusal-first (R2 C3) generate/constraint_comprehension/solver.py: solve_two_var_linear (order-independent 2x2 integer Cramer's rule over typed constraints), the solve_two_var_count_weight specialization, and solve/answer_constraint_problem driving it from a ConstraintProblem. Four typed refusals: indistinguishable_weights (det==0), non_integer_solution (numer%det!=0, never rounds), negative_solution, verification_failed (identity backstop). Ties to the C2 gold: solves all 7 solved fixtures to their gold value and refuses all 3 solver_refuses fixtures with EXACTLY the gold-claimed reason (the gold's reason is now solver-verified, not just annotation). Per-refusal meaningful-fail + positive re-substitution. Off-serving. 9 tests.	2026-06-07 07:23:23 -07:00
Shay	e71531c0c9	feat(constraint): R2 linear-constraint IR — typed problem model (R2 C1) generate/constraint_comprehension/{expr,model}.py: frozen, slots'd dataclasses, no behavior. expr = LinearExpr (sum(coeff*symbol)+constant) + LinearConstraint (lhs eq rhs, optional source_span). model = Unknown (symbol/entity/unit/finite-integer domain), AttributeFact (per-category coefficient provenance), ConstraintQuery (symbol+unit), ConstraintProblem (unknowns/facts/constraints/query). Terms pinned as (symbol, coefficient) to match the gold serialization. Query is a minimal dedicated type, not R1's BoundUnknown (no degenerate fit). Off-serving package; no generate.derivation / reliability_gate import. 9 IR tests (shape + frozen + defaults).	2026-06-07 07:10:20 -07:00

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Shay

4ddaef4d00

feat(constraint): two-category reader — prose to ConstraintProblem (R2 C5-C9)

generate/constraint_comprehension/reader.py: read_constraint_problem comprehends two-category constraint prose into a typed ConstraintProblem via five recognizers — C5 category-pair (from coefficient clauses; >2 -> too_many_categories), C6 coefficient (Each <cat> holds/has/costs/is-worth <N> <unit>; shared measured unit), C7 total-count (collective-unit sentence -> x+y=N; absent -> missing_total_count), C8 weighted-total (measured-unit sentence -> ax+by=T; absent -> missing_weighted_total), C9 query-target (How many <cat> -> the asked unknown). Refuses, never mis-assembles.

Reconciles the sketch's 'no equal coefficients' note: equal coefficients are a SOLVER refusal (indistinguishable_weights), not a reader one — the reader reads r2-010 setup_correct and the solver refuses it. run_reader lane + 'reader' CLI subcommand. R2 reader: setup_correct 10 / setup_wrong 0 / refused_correct 3; R1 7/0/3 and 15-case 15/0/0 unchanged. Off-serving. 8 reader tests incl. full read->solve->verify chain + meaningful-fail guards.

2026-06-07 07:34:55 -07:00

Shay

babcf2fdb2

feat(constraint): exact integer 2-var solver — Cramer's rule, refusal-first (R2 C3)

generate/constraint_comprehension/solver.py: solve_two_var_linear (order-independent 2x2 integer Cramer's rule over typed constraints), the solve_two_var_count_weight specialization, and solve/answer_constraint_problem driving it from a ConstraintProblem. Four typed refusals: indistinguishable_weights (det==0), non_integer_solution (numer%det!=0, never rounds), negative_solution, verification_failed (identity backstop).

Ties to the C2 gold: solves all 7 solved fixtures to their gold value and refuses all 3 solver_refuses fixtures with EXACTLY the gold-claimed reason (the gold's reason is now solver-verified, not just annotation). Per-refusal meaningful-fail + positive re-substitution. Off-serving. 9 tests.

2026-06-07 07:23:23 -07:00

Shay

e71531c0c9

feat(constraint): R2 linear-constraint IR — typed problem model (R2 C1)

generate/constraint_comprehension/{expr,model}.py: frozen, slots'd dataclasses, no behavior. expr = LinearExpr (sum(coeff*symbol)+constant) + LinearConstraint (lhs eq rhs, optional source_span). model = Unknown (symbol/entity/unit/finite-integer domain), AttributeFact (per-category coefficient provenance), ConstraintQuery (symbol+unit), ConstraintProblem (unknowns/facts/constraints/query).

Terms pinned as (symbol, coefficient) to match the gold serialization. Query is a minimal dedicated type, not R1's BoundUnknown (no degenerate fit). Off-serving package; no generate.derivation / reliability_gate import. 9 IR tests (shape + frozen + defaults).

2026-06-07 07:10:20 -07:00

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