feat: prompt REPL — emoji 🪟 + shell actif après la version

Le statut avant chaque invite affiche maintenant le shell-gateway courant (ex: ⚙ am v1.0.0 🪟 bash │ ...), mis à jour dynamiquement via 'shell <name>'. Vérifié en réel : bash → pwsh après switch.

src/repl.rs

@@ -890,13 +890,18 @@ fn emoji(glyph: &str, style: &str, theme: &Theme, color: bool) -> String {
 }
 
 /// One-line status shown before every prompt, with colored emojis:
-///  ⚙ am v0.2.13 │ 🗂️ cwd │ 73 🤖 · 12 🌐 · 0 📊 │ ⚡ 97ms │ ⏲ 32s
-/// The last parameter is the duration of the previous command (None before
-/// the first one).
-fn print_status(app: &App, started: Instant, last: Option<Duration>) {
+///  ⚙ am v0.2.13 🪟 bash │ 🗂️ cwd │ 73 🤖 · 12 🌐 · 0 📊 │ ⚡ 97ms │ ⏲ 32s
+/// `shell` is the active shell-gateway name (issue #44). The last parameter
+/// is the duration of the previous command (None before the first one).
+fn print_status(app: &App, started: Instant, last: Option<Duration>, shell: &str) {
     let color = app.color();
     let theme = app.theme();
     let sep = dim(" │ ", theme, color);
+    let shell_part = format!(
+        "{} {}",
+        emoji("🪟", "cyan", theme, color),
+        dim(shell, theme, color)
+    );
     let cwd = shorten_head(&current_dir_string(), 30);
     let folder = format!(
         "{} {}",
@@ -931,7 +936,7 @@ fn print_status(app: &App, started: Instant, last: Option<Duration>) {
         color,
     );
     println!(
-        "{}am v{}{sep}{folder}{sep}{counts}{sep}{last_part}{sep}{elapsed}",
+        "{}am v{}{sep}{shell_part}{sep}{folder}{sep}{counts}{sep}{last_part}{sep}{elapsed}",
         dim(" ⚙ ", theme, color),
         env!("CARGO_PKG_VERSION"),
     );
@@ -1142,7 +1147,7 @@ fn run_with_editor(app: &App, session: &mut ShellSession, sid: &str) -> Result<i
     let mut first_read = true;
     let mut theme: &'static crate::theme::Theme = app.theme();
     loop {
-        print_status(app, started, last_duration);
+        print_status(app, started, last_duration, &session.current.name);
         let signal = match rl.read_line(&prompt) {
             Ok(signal) => signal,
             Err(e) => {
@@ -1231,7 +1236,7 @@ fn run_plain(app: &App, session: &mut ShellSession, sid: &str) -> Result<i32> {
     let mut last: Option<DataTable> = None;
     let mut last_duration: Option<Duration> = None;
     loop {
-        print_status(app, started, last_duration);
+        print_status(app, started, last_duration, &session.current.name);
         eprint!("❯ ");
         std::io::stderr().flush().ok();
         let mut line = String::new();