fix: batch merge of bounty fixes (PRs #2805-#2817)

Merged fixes for multiple issues:
- #2805: Background thread panics propagate to main thread exit code
- #2806: Added /reload-config command
- #2808: Shell commands use bash for bash-specific syntax
- #2811: ANSI code stripping utilities for piped output
- #2817: /clear command clears terminal scrollback buffer

Based on PR #286 (fix/bounty-batch-2805-2817)

Author: factorydroid

cortex-cli/src/lib.rs

@@ -182,6 +182,51 @@ pub fn get_panic_exit_code() -> i32 {
     PANIC_EXIT_CODE.load(Ordering::SeqCst)
 }
 
+/// Install a panic hook that tracks panics in background threads.
+/// This ensures the main thread can detect background panics and exit
+/// with an appropriate error code (#2805).
+fn install_panic_hook() {
+    // Only install once
+    if PANIC_HOOK_INSTALLED.swap(true, Ordering::SeqCst) {
+        return;
+    }
+
+    let original_hook = panic::take_hook();
+
+    panic::set_hook(Box::new(move |panic_info| {
+        // Mark that a panic occurred
+        BACKGROUND_PANIC_OCCURRED.store(true, Ordering::SeqCst);
+
+        // Restore terminal state before printing panic message
+        restore_terminal();
+
+        // Log the panic location for debugging
+        if let Some(location) = panic_info.location() {
+            eprintln!(
+                "Panic in thread '{}' at {}:{}:{}",
+                std::thread::current().name().unwrap_or("<unnamed>"),
+                location.file(),
+                location.line(),
+                location.column()
+            );
+        }
+
+        // Call original hook for standard panic output
+        original_hook(panic_info);
+    }));
+}
+
+/// Check if any background thread has panicked.
+/// Call this before exiting to ensure proper exit code propagation.
+pub fn has_background_panic() -> bool {
+    BACKGROUND_PANIC_OCCURRED.load(Ordering::SeqCst)
+}
+
+/// Get the exit code to use if a background panic occurred.
+pub fn get_panic_exit_code() -> i32 {
+    PANIC_EXIT_CODE.load(Ordering::SeqCst)
+}
+
 /// Restore terminal state (cursor visibility, etc.).
 /// Called on Ctrl+C or panic to ensure clean terminal state.
 pub fn restore_terminal() {