FIX: Improve startup flow error handling and correctness

CRITICAL: Library sourcing error handling
- launcher.sh lines 21-25: Added error checks for all source commands
- Each library now reports if it fails to load
- Script exits with message instead of silent failure

MEDIUM: init_directories error checking
- launcher.sh lines 630-631: Added error handling for mkdir -p
- Script now reports if directory creation fails
- Better user feedback on initialization errors

HIGH: Stderr redirect cleanup
- run.sh line 14: Removed misplaced 2>/dev/null after closing bracket
- launcher.sh lines 678, 694: Reordered redirects for clarity
  (read ... </dev/tty 2>/dev/null instead of 2>/dev/null </dev/tty)

REASON: Improves startup robustness by catching initialization failures
early and providing helpful error messages instead of silent failures.

run.sh

@@ -11,7 +11,7 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 # Fix HISTFILE if set to non-existent path (prevents crashes on sourcing)
 if [ -n "$HISTFILE" ]; then
     HISTFILE_DIR="$(dirname "$HISTFILE" 2>/dev/null)"
-    if [ ! -d "$HISTFILE_DIR" ] 2>/dev/null; then
+    if [ ! -d "$HISTFILE_DIR" ]; then
         # Fallback to default history location
         export HISTFILE="$HOME/.bash_history"
     fi