v0.2.14 : aide Nushell, themes de couleurs et cadres blancs

- Aide facon Nushell : help <cmd>, <cmd> -h/--help, help, help commands,
  help --find <texte>, help <agent> (fiche info) - sections Usage/Flags/
  Command Type/Parameters/Input-output/Examples avec couleurs
- Commande version : tableau Nushell (commit, build, rustc, theme...) + --json ;
  build.rs pour commit/branche git ; -V reste la version courte
- Themes : --theme <nom> (default, ocean, sunset, forest, dracula, mono)
  + settings.theme dans la config ; activation VT Windows pour les couleurs
- Cadres blancs Nushell partages : list, search, status, doctor, ls/ps/
  where/get et menu d autocompletion Tab encadre (colonnes name/description)

src/lib.rs

@@ -19,6 +19,7 @@ pub mod config;
 pub mod deps;
 pub mod doctor;
 pub mod download;
+pub mod help;
 pub mod installers;
 pub mod nav;
 pub mod output;
@@ -30,6 +31,7 @@ pub mod runner;
 pub mod shell;
 pub mod state;
 pub mod tables;
+pub mod theme;
 pub mod toolchain;
 pub mod version;
 
@@ -37,6 +39,17 @@ use clap::Parser;
 
 /// CLI entry point used by the am binary. Returns the process exit code.
 pub fn main_entry() -> i32 {
+    // Enable ANSI escape sequences on Windows consoles (best effort): the
+    // colored crate and the theme palettes both emit raw VT codes.
+    #[cfg(windows)]
+    let _ = colored::control::set_virtual_terminal(true);
+
+    // Nushell-style help: 'am -h', 'am install -h', 'am ls --help', ... all
+    // show the custom help before clap gets a chance to parse the line.
+    let args: Vec<String> = std::env::args().collect();
+    if let Some(code) = help::intercept(&args) {
+        return code;
+    }
     let cli = cli::Cli::parse();
     match app::App::from_cli(cli) {
         Ok(app) => match commands::execute(&app) {