Check committed file sizes

docs/roadmap/implementation.md

@@ -386,6 +386,13 @@ The rule applies to candidate contents even when testing disables workspace use.
 
 ## Stage 8: Inspect individual committed file sizes
 
+**Completion:** Complete. `Validation.FileSize` and `validation.file_size` enable
+a per-blob decimal-byte limit with a 1,000,000-byte default, strict greater-than
+comparison, and literal repository-relative file/directory exclusions. The check
+uses captured blob sizes, counts symlink link text, omits gitlinks, and reports
+one oversized file with its measurement. Nil disables the check, and historical
+or aggregate repository size is outside its scope.
+
 **Outcome:** Optional limits and intentional path exceptions are operational.
 
 1. Add `FileSizeValidationSpec`, `ValidationSpec.FileSize`, and matching JSON