feat: phase 2 — modèles locaux + catalogue distant + suggest (closes #70 #71 #73 #60 #67 #61)

Axe 11 (modèles) :
- am models : inventaire des runtimes locaux (ollama list --format json,
  llama.cpp .gguf sur disque, LM Studio API locale) avec cache façon
  probe.rs (TTL 30s) et absence de runtime signalée sans erreur fatale
- am run <agent> --model <m> : résolution dans l'inventaire, transmission
  via model_env/model_arg de l'agent (défaut AM_MODEL), tracé en session
- am models --prune : candidats inutilisés depuis settings.models_prune_days
  (défaut 30), :latest toujours protégé, dry-run + confirmation + événement
  EventKind::Model journalisé

Axes 7/9 (catalogue) :
- am catalog update : fetch du catalogue officiel, diff (ajoutés/retirés/
  modifiés), confirmation, enregistrement en include
- am catalog add <url> : validation du format (parse + validate), cache
  catalog-cache.json (TTL 3600s), événement EventKind::Catalog journalisé
- include par URL (http/https/file) dans config.yaml, résolu au chargement
  avec cache + TTL ; override local toujours prioritaire (issue #67)
- am suggest <requête> : réutilise le scoring fuzzy du catalogue, boost par
  usage réel (lancements + durée depuis le journal), top 5 justifié, --json

REPL : commandes models/catalog/suggest (parse, complétion, descriptions),
help specs, tip cheat sheet, man pages régénérées (49 pages, dont 3 nouvelles).
Version bump 0.4.5, ROADMAP cases cochées, 266 tests verts.

src/repl.rs

@@ -56,6 +56,8 @@ pub struct AmCompleter {
     groups: Vec<String>,
     /// 'profile' subcommands.
     profile_sub: Vec<&'static str>,
+    /// 'catalog' subcommands (issues #60 #67).
+    catalog_sub: Vec<&'static str>,
     /// Short descriptions shown next to candidates in the Tab menu
     /// (Nushell-style).
     descriptions: BTreeMap<String, String>,
@@ -104,6 +106,9 @@ const COMMAND_DESCRIPTIONS: &[(&str, &str)] = &[
     ("tags", "list personal tags"),
     ("profile", "manage environment profiles"),
     ("man", "readable man page in the terminal"),
+    ("models", "list local models (ollama, llama.cpp, LM Studio)"),
+    ("catalog", "manage remote catalogs"),
+    ("suggest", "recommend an agent for a request"),
     ("shell", "show or switch the system shell"),
     ("theme", "show or switch the color theme"),
     ("tip", "cheat sheet of the most useful commands"),
@@ -217,11 +222,12 @@ impl AmCompleter {
                 "start", "stop", "restart", "run", "doctor", "config", "completion",
                 "self-update", "self-uninstall", "export", "import", "shell", "theme",
                 "tip", "dashboard", "favorite", "unfavorite", "note", "tag", "untag", "tags",
-                "profile", "man",
+                "profile", "man", "models", "catalog", "suggest",
                 "ls", "dir", "cd", "ps", "where", "get", "help", "version", "exit",
             ],
             config_sub: vec!["show", "path", "edit", "validate", "add"],
             profile_sub: vec!["list", "show"],
+            catalog_sub: vec!["update", "add", "list"],
             shells: vec!["bash", "zsh", "fish", "powershell", "elvish"],
             gateway_shells: vec![
                 "list", "bash", "zsh", "fish", "powershell", "pwsh", "cmd", "sh", "nu",
@@ -265,6 +271,9 @@ impl AmCompleter {
                 "profile" => {
                     pool = self.profile_sub.iter().map(|s| s.to_string()).collect();
                 }
+                "catalog" => {
+                    pool = self.catalog_sub.iter().map(|s| s.to_string()).collect();
+                }
                 "completion" => {
                     pool = self.shells.iter().map(|s| s.to_string()).collect();
                 }
@@ -759,6 +768,9 @@ pub fn banner_box(
     rows.push(inner(
         "  config     alias · secret · profile · config · doctor · completion · man · tip".to_string(),
     ));
+    rows.push(inner(
+        "  models     models · models --prune · catalog · suggest".to_string(),
+    ));
     rows.push(inner(
         "  system     self-update · self-uninstall · export · import".to_string(),
     ));
@@ -1416,6 +1428,32 @@ fn handle_line(
                 return Ok(false);
             }
         },
+        "models" => Command::Models(crate::cli::ModelsArgs {
+            prune: flag("--prune"),
+            dry_run: flag("--dry-run"),
+            yes: flag("--yes") || app.yes(),
+            days: opt_value("--days").and_then(|v| v.parse().ok()),
+        }),
+        "catalog" => match rest.first().map(|s| s.as_str()) {
+            Some("update") | None => Command::Catalog(crate::cli::CatalogCmd::Update),
+            Some("add") if rest.len() >= 2 => Command::Catalog(crate::cli::CatalogCmd::Add {
+                url: rest[1].clone(),
+            }),
+            Some("list") => Command::Catalog(crate::cli::CatalogCmd::List),
+            _ => {
+                app.log.error("usage: catalog update | catalog add <url> | catalog list");
+                return Ok(false);
+            }
+        },
+        "suggest" => {
+            if rest.is_empty() {
+                app.log.error("usage: suggest <requête> — ex: suggest un agent pour du Python");
+                return Ok(false);
+            }
+            Command::Suggest {
+                words: rest.to_vec(),
+            }
+        },
         "alias" => match rest.first().map(|s| s.as_str()) {
             Some("add") if rest.len() >= 3 => Command::Alias(crate::cli::AliasCmd::Add {
                 name: rest[1].clone(),
@@ -1583,6 +1621,7 @@ fn handle_line(
             let agent = need("agent name")?;
             Command::Run {
                 agent,
+                model: opt_value("--model"),
                 args: rest[1..].iter().map(|s| s.as_str().into()).collect(),
             }
         }