feat: phase 2 — coûts par session (stats --costs) + am monitor TUI (closes #49 #50)

src/repl.rs

@@ -112,6 +112,7 @@ const COMMAND_DESCRIPTIONS: &[(&str, &str)] = &[
     ("audit", "who changed what, when (config checksums)"),
     ("service", "register an agent as a system service (autostart)"),
     ("schedule", "plan am commands (daily) and check the fleet health"),
+    ("monitor", "real-time TUI of managed processes (cpu/rss/uptime)"),
     ("shell", "show or switch the system shell"),
     ("theme", "show or switch the color theme"),
     ("tip", "cheat sheet of the most useful commands"),
@@ -226,7 +227,7 @@ impl AmCompleter {
                 "self-update", "self-uninstall", "export", "import", "shell", "theme",
                 "tip", "dashboard", "favorite", "unfavorite", "note", "tag", "untag", "tags",
                 "profile", "man", "models", "catalog", "suggest", "audit",
-                "service", "schedule",
+                "service", "schedule", "monitor",
                 "ls", "dir", "cd", "ps", "where", "get", "help", "version", "exit",
             ],
             config_sub: vec!["show", "path", "edit", "validate", "add"],
@@ -776,7 +777,7 @@ pub fn banner_box(
         "  models     models · models --prune · catalog · suggest · audit".to_string(),
     ));
     rows.push(inner(
-        "  automate   service install · schedule add · doctor --watch".to_string(),
+        "  automate   service install · schedule add · doctor --watch · monitor".to_string(),
     ));
     rows.push(inner(
         "  system     self-update · self-uninstall · export · import".to_string(),
@@ -1532,6 +1533,11 @@ fn handle_line(
         "stats" => Command::Stats {
             agent: rest.first().cloned(),
             period: opt_value("--period"),
+            costs: flag("--costs"),
+        },
+        "monitor" => Command::Monitor {
+            interval: opt_value("--interval").and_then(|v| v.parse().ok()),
+            json: flag("--json"),
         },
         "top" => Command::Top {
             period: opt_value("--period"),