test: cover compatibility method field returns

docs/ROADMAP.md

@@ -41,7 +41,7 @@ See `CURRENT_STATUS.md` for the detailed feature matrix.
 - Keep method field examples balanced across syntax generations: compatibility `TAKES` / `LEARNED` YESNO assignment now has a positive fixture beside the modern and compatibility mismatch fixtures, and modern plus compatibility YESNO method-field metadata now have dedicated positive fixtures beside the negative fixture.
 - Keep IDE metadata aligned with the current beginner syntax: typed-language keywords such as `RETURNS`, `CHECK`, and `TYPE` are now included in the metadata used by editor helpers.
 - Keep compatibility-call coverage aligned with modern calls: empty `CALL object.method WITH` forms now have a focused missing-argument diagnostic fixture alongside the modern `DO object.method` case.
-Keep declared return types honest: `claro typecheck` now reports friendly diagnostics for unknown declared return types, mismatched, not-yet-inferable, and empty return expressions, declarations with no `RETURN`, and incomplete conditional branches, when a simple function or object method declares `RETURNS TYPE`; the declaration keyword is case-insensitive like other Claro keywords, with positive coverage in modern and compatibility function forms, including lowercase compatibility declarations and lowercase compatibility method declarations, plus a lowercase compatibility-method mismatch fixture. Complete `IF`/`ELSE` return branches, including nested complete conditionals in functions and methods, are accepted, and modern and compatibility function syntax plus compatibility method syntax are covered by focused fixtures. `CHECK TYPE` parameter metadata also informs arithmetic return-expression checking, including object methods; positive numeric multiplication return coverage now sits beside the mismatch fixtures, including a dedicated compatibility-method multiplication success fixture; typed methods can also return class-declared fields by simple name, with positive and mismatch fixtures, and unknown method return expressions now have dedicated modern and compatibility diagnostic fixtures, and NUMBER return expressions with known TEXT arithmetic operands identify the operation and offending operand, including focused addition, subtraction, multiplication, and division coverage for functions and methods. Compatibility method subtraction diagnostics are also covered alongside the existing addition diagnostic. Full path-sensitive analysis across nested conditionals and loops remains planned.
+Keep declared return types honest: `claro typecheck` now reports friendly diagnostics for unknown declared return types, mismatched, not-yet-inferable, and empty return expressions, declarations with no `RETURN`, and incomplete conditional branches, when a simple function or object method declares `RETURNS TYPE`; the declaration keyword is case-insensitive like other Claro keywords, with positive coverage in modern and compatibility function forms, including lowercase compatibility declarations and lowercase compatibility method declarations, plus a lowercase compatibility-method mismatch fixture. Complete `IF`/`ELSE` return branches, including nested complete conditionals in functions and methods, are accepted, and modern and compatibility function syntax plus compatibility method syntax are covered by focused fixtures. `CHECK TYPE` parameter metadata also informs arithmetic return-expression checking, including object methods; positive numeric multiplication return coverage now sits beside the mismatch fixtures, including a dedicated compatibility-method multiplication success fixture; typed methods can also return class-declared fields by simple name, with positive and mismatch fixtures in both modern and compatibility method syntax, and unknown method return expressions now have dedicated modern and compatibility diagnostic fixtures, and NUMBER return expressions with known TEXT arithmetic operands identify the operation and offending operand, including focused addition, subtraction, multiplication, and division coverage for functions and methods. Compatibility method subtraction diagnostics are also covered alongside the existing addition diagnostic. Full path-sensitive analysis across nested conditionals and loops remains planned.
 
 7. Keep method-body field diagnostics learner-facing: typed methods now name the class method when a simple class field receives a known mismatch in `CHECK TYPE` or assignment, or a known TEXT operand in a NUMBER expression, with matching text and numeric coverage in modern and compatibility method syntax; direct assignments to undeclared method fields now report the missing field when the value type is known, and bare `CHECK TYPE missing IS TYPE` statements inside methods now use the expected type in the repair hint in both modern and compatibility method syntax; broader control-flow and object-flow analysis remains planned.
 8. Keep method-body coverage balanced across beginner field types and syntax generations: YESNO field assignment mismatches are now validated for both modern `DO` and compatibility `CALL ... WITH` method syntax, method-body `CHECK TYPE` metadata mismatches now have matching compatibility `TAKES` / `LEARNED` coverage alongside the modern form, compatibility YESNO field metadata has dedicated positive and negative fixtures, and compatibility method assignments to undeclared fields have the same focused missing-field diagnostic as modern methods.