fix(lint): clean up fabro-config test clippy warnings

- 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

lib/crates/fabro-config/src/config.rs

@@ -151,6 +151,8 @@ impl ConfigLayer {
 
 #[cfg(test)]
 mod tests {
+    use fabro_types::settings::v2::InterpString;
+
     use super::*;
 
     #[test]
@@ -179,7 +181,7 @@ goal = "Do things"
                 .run
                 .as_ref()
                 .and_then(|r| r.goal.as_ref())
-                .map(fabro_types::settings::v2::InterpString::as_source)
+                .map(InterpString::as_source)
                 .as_deref(),
             Some("Do things")
         );
@@ -210,7 +212,7 @@ goal = "lower goal"
                 .run
                 .as_ref()
                 .and_then(|r| r.goal.as_ref())
-                .map(fabro_types::settings::v2::InterpString::as_source)
+                .map(InterpString::as_source)
                 .as_deref(),
             Some("higher goal")
         );

lib/crates/fabro-config/src/lib.rs

@@ -15,7 +15,6 @@ pub mod storage;
 pub mod user;
 
 pub use config::ConfigLayer;
-pub use fabro_types::Combine;
 pub use fabro_util::path::expand_tilde;
 pub use home::Home;
 pub use storage::{RunScratch, ServerState, Storage};

lib/crates/fabro-config/src/merge.rs

@@ -479,8 +479,9 @@ fn combine_server_integrations(
 
 #[cfg(test)]
 mod tests {
+    use fabro_types::settings::v2::{InterpString, parse_settings_file};
+
     use super::*;
-    use fabro_types::settings::v2::parse_settings_file;
 
     fn parse(input: &str) -> SettingsFile {
         parse_settings_file(input).expect("fixture should parse")
@@ -505,7 +506,7 @@ a = "higher"
         let inputs = merged.run.unwrap().inputs.unwrap();
         assert_eq!(inputs.len(), 1);
         assert_eq!(inputs.get("a"), Some(&toml::Value::String("higher".into())));
-        assert!(inputs.get("b").is_none(), "lower key should be gone");
+        assert!(!inputs.contains_key("b"), "lower key should be gone");
     }
 
     #[test]
@@ -593,7 +594,11 @@ script = "higher-script"
         let hooks = merged.run.unwrap().hooks;
         assert_eq!(hooks.len(), 1);
         assert_eq!(
-            hooks[0].script.as_ref().map(|s| s.as_source()).as_deref(),
+            hooks[0]
+                .script
+                .as_ref()
+                .map(InterpString::as_source)
+                .as_deref(),
             Some("higher-script")
         );
     }
@@ -618,11 +623,19 @@ script = "higher-anon"
         let hooks = merged.run.unwrap().hooks;
         assert_eq!(hooks.len(), 2);
         assert_eq!(
-            hooks[0].script.as_ref().map(|s| s.as_source()).as_deref(),
+            hooks[0]
+                .script
+                .as_ref()
+                .map(InterpString::as_source)
+                .as_deref(),
             Some("lower-anon")
         );
         assert_eq!(
-            hooks[1].script.as_ref().map(|s| s.as_source()).as_deref(),
+            hooks[1]
+                .script
+                .as_ref()
+                .map(InterpString::as_source)
+                .as_deref(),
             Some("higher-anon")
         );
     }
@@ -643,7 +656,7 @@ events = ["...", "run.completed"]
         );
         let merged = combine_files(lower, higher);
         let run = merged.run.unwrap();
-        let events = &run.notifications.get("ops").unwrap().events;
+        let events = &run.notifications["ops"].events;
         assert_eq!(events.len(), 2);
     }
 

lib/crates/fabro-config/src/project.rs

@@ -415,12 +415,12 @@ directory = "fabro/"
     #[test]
     fn parse_with_run_execution_retros() {
         let config = parse_project_config(
-            r#"
+            "
 _version = 1
 
 [run.execution]
 retros = true
-"#,
+",
         )
         .unwrap();
         assert_eq!(
@@ -449,7 +449,7 @@ retros = true
         let err = parse_project_config("_version = 2\n").unwrap_err();
         let chain: String = err
             .chain()
-            .map(|e| e.to_string())
+            .map(ToString::to_string)
             .collect::<Vec<_>>()
             .join("; ");
         assert!(