feat: store midenup version for migrations

src/commands/install.rs

@@ -333,6 +333,10 @@ fn target_installation(
             target: config.target().to_string(),
         },
         installed_at: chrono::Utc::now().timestamp(),
+        midenup_version: Some(
+            semver::Version::parse(env!("CARGO_PKG_VERSION"))
+                .expect("CARGO_PKG_VERSION is always valid semver"),
+        ),
     })
 }
 

src/migrate_v1.rs

@@ -177,6 +177,7 @@ pub fn migrate_if_needed(home: &Path) -> Result<MigrationOutcome, MigrationError
             components: Vec::new(),
             publication: PublicationRef::NeedsReinstall,
             installed_at,
+            midenup_version: None,
         });
     }
 

src/publish/journal.rs

@@ -407,6 +407,7 @@ mod tests {
                 target: "aarch64-apple-darwin".to_string(),
             },
             installed_at: 1735689600,
+            midenup_version: None,
         }
     }
 

src/publish/mod.rs

@@ -384,6 +384,7 @@ mod tests {
                 target: "aarch64-apple-darwin".to_string(),
             },
             installed_at: 1735689600,
+            midenup_version: None,
         });
 
         assert_eq!(
@@ -426,6 +427,7 @@ mod tests {
                     target: "aarch64-apple-darwin".to_string(),
                 },
                 installed_at: 1735689600,
+                midenup_version: None,
             },
         );
         journal::prepare(home, &entry).unwrap();

src/state/installation.rs

@@ -104,6 +104,9 @@ pub struct Installation {
     pub publication: PublicationRef,
     /// UTC epoch seconds.
     pub installed_at: i64,
+    /// The midenup version that produced this installation's on-disk layout.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub midenup_version: Option<semver::Version>,
 }
 
 impl Installation {

src/state/mod.rs

@@ -181,6 +181,7 @@ mod tests {
                     target: "aarch64-apple-darwin".to_string(),
                 },
                 installed_at: 1735689600,
+                midenup_version: None,
             }],
         }
     }