- Drop the fabro_types::Combine re-export from fabro-config/lib.rs
(unused externally after Stage 3 replaced the legacy Combine-based
merge with the v2 merge matrix)
- Replace absolute `fabro_types::settings::v2::InterpString` paths in
fabro-config/src/config.rs and merge.rs test blocks with a scoped
`use` import, satisfying clippy::absolute_paths
- fabro-config/src/merge.rs tests: use `!contains_key`, drop redundant
closures around InterpString::as_source, prefer indexing over
get().unwrap() on the notifications HashMap
- fabro-config/src/project.rs tests: switch the run.execution.retros
fixture off raw string literal hashes (only simple content inside)
and use ToString::to_string in the error-chain join expression
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