events : instrumentation start/stop/run/install/update/uninstall/doctor/repl/shell (issue #3) - un evenement JSONL par action reelle, dry-run sans evenement, session id sur start, duree et exit code sur stop/run

src/app.rs

@@ -121,6 +121,23 @@ impl App {
         self.theme.set(theme);
     }
 
+    /// Directory of the event journal (the state directory).
+    pub fn events_dir(&self) -> PathBuf {
+        self.paths
+            .state_file
+            .parent()
+            .map(|p| p.to_path_buf())
+            .unwrap_or_else(|| self.paths.state_file.clone())
+    }
+
+    /// Append an event to the journal; failures are never fatal (logged at
+    /// verbose level only).
+    pub fn emit(&self, event: &crate::events::Event) {
+        if let Err(e) = crate::events::append(&self.events_dir(), event) {
+            self.log.verbose(&format!("cannot write event journal: {e:#}"));
+        }
+    }
+
     /// Ask the user for confirmation on stderr. Accepts y/yes/o/oui.
     pub fn confirm(&self, question: &str) -> Result<bool> {
         if self.cli.yes {