feat: llm responder

.php-cs-fixer.php

composer.json

composer.lock

src/AcceptHeaderTest.php

src/ArrayFlattenIteratorTest.php

src/Attribute/RespondsToPromptSubject.php

src/BackusNaurFormGrammar.php

src/BackusNaurFormGrammar/SubjectActionGrammar.php

src/Constraint/AnyConstraintTest.php

src/Constraint/AnyOfConstraintTest.php

src/Constraint/BooleanConstraintTest.php

src/Constraint/ConstConstraintTest.php

src/Constraint/EnumConstraintTest.php

src/Constraint/FilenameConstraintTest.php

src/Constraint/IntegerConstraintTest.php

src/Constraint/ListConstraintTest.php

src/Constraint/MapConstraintTest.php

src/Constraint/NumberConstraintTest.php

src/Constraint/ObjectConstraintTest.php

src/Constraint/StringConstraintTest.php