Function scope_migration_notes 

pub fn scope_migration_notes(source: &Source) -> Vec<ScopePatternNote>

Name every scope pattern of source that reads as the retired workspace-relative dialect: one that begins with the source’s own pointer, so it selected artifacts before the 2026-08-27 join and selects nothing after it.

A pointer-less source has no dialect to migrate (the two readings coincide — which is exactly why the defect stayed invisible on the scaffolded path), so it returns empty. A **-prefixed pattern is prefix-free and matched under both readings, so it is not reported.