fix: version strings showed 4.2.0; use CARGO_PKG_VERSION so they never go stale

The REPL banner and HTML-report footer hardcoded v4.2.0 while the crate is 4.2.1.
Both now interpolate env!("CARGO_PKG_VERSION"); web title/sidebar/comments set to
4.2.1. --version already read the crate version.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

neurosploit-rs/app/src/repl.rs

@@ -1,4 +1,4 @@
-//! NeuroSploit v4.2.0 — interactive session (Claude-Code / Codex / Cursor-CLI style).
+//! NeuroSploit v4.2.1 — interactive session (Claude-Code / Codex / Cursor-CLI style).
 //!
 //! Launched when `neurosploit` runs with no subcommand. A persistent REPL with
 //! real line editing (arrow-key history recall, Ctrl-A/E/K, paste), model
@@ -440,7 +440,7 @@ pub async fn repl(base: &Path, auth: SessionAuth) -> anyhow::Result<()> {
     let backends = harness::installed_cli_backends();
     println!("\x1b[1m");
     println!("  ███╗   ██╗███████╗██╗   ██╗██████╗  ██████╗");
-    println!("  ████╗  ██║██╔════╝██║   ██║██╔══██╗██╔═══██╗   NeuroSploit v4.2.0");
+    println!("  ████╗  ██║██╔════╝██║   ██║██╔══██╗██╔═══██╗   NeuroSploit v{}", env!("CARGO_PKG_VERSION"));
     println!("  ██╔██╗ ██║█████╗  ██║   ██║██████╔╝██║   ██║   interactive harness");
     println!("  ██║╚██╗██║██╔══╝  ██║   ██║██╔══██╗██║   ██║   by Joas A Santos");
     println!("  ██║ ╚████║███████╗╚██████╔╝██║  ██║╚██████╔╝   & Red Team Leaders");

neurosploit-rs/app/src/tui.rs

@@ -1,4 +1,4 @@
-//! NeuroSploit v4.2.0 — TUI "Mission Control" mode.
+//! NeuroSploit v4.2.1 — TUI "Mission Control" mode.
 //!
 //! Concurrent panels that update live while the engagement runs in the
 //! background, with a composer input that stays active during execution: