Summary

• Change AstSignature.signatureWithInput to return a result object containing the signature document plus referenced fields, used directives, field arguments, directive arguments, and input object fields.
• Collect references during the existing input-redaction pass instead of walking the redacted/sorted document a second time.
• Record per-fragment references during fragment redaction and merge only fragments reachable from the selected operation's fragment-spread graph.
• Add focused AstSignature tests for omitted variables, directive arguments, used directives, variable-definition directives, fragments, recursive/unreferenced fragments, interfaces/unions, and result transform coverage.

Test

• ./gradlew test --tests graphql.language.AstSignatureTest jacocoTestReport --rerun-tasks

Coverage

• Focused JaCoCo source report shows no missed lines or branches for AstSignatureInputReferences, AstSignatureReferenceCollector, and AstSignatureWithInputResult.
• AstSignature has 100% line coverage in the focused run; remaining branch misses are pre-existing branches outside this change.