Validate schemas without relying on source filenames

docs/roadmap/remediation.md

@@ -72,7 +72,12 @@ existing cancellation policy.
 
 ### 2. Check Schema Self-Containment Independently Of Its Source Filename [P2]
 
-**Status:** Open. **Stages:** 11–13.
+**Status:** Complete. **Stages:** 11–13.
+
+Completion: shared compilation checks both the source base and an unrelated
+submission base through the same compiler rules, including unused declarations.
+Host and filesystem regressions preserve fragment, explicit-ID, and embedded-ID
+references while rejecting unsent source-name dependencies.
 
 **Locations:** [schema compilation](../../internal/validate/standard_validator.go),
 `compileSchemaDocument`, lines 426–445, and its host/`fs.FS` callers;