Consolidate duplicate functions, bump to v1.0.1

- Remove duplicate log/error_exit/warning/success/info from hops and
  uninstall; remove validate_password, generate_secure_password,
  create_docker_networks, validate_timezone from install. Single
  canonical copies now live in lib/common.sh, lib/security.sh,
  lib/validation.sh, and lib/docker.sh (A5, Q1)
- Fix lib/docker.sh, lib/validation.sh, lib/security.sh to use LIB_DIR
  instead of SCRIPT_DIR so sourcing them inside a function does not
  clobber the caller's SCRIPT_DIR
- Move SCRIPT_VERSION to lib/common.sh as the single source of truth;
  remove local declarations from hops, install, and uninstall
- uninstall now sources lib/common.sh directly for standalone safety
- validate_timezone updated to warn-and-default instead of error_exit
- validate_password updated to handle empty input (return 3)
- Update CHANGELOG and TODO to reflect resolved items (B1-B6, A1, A3,
  A5, Q1) and bump version to 1.0.1

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/validation.sh

@@ -5,8 +5,8 @@
 # Version: 1.0.0
 
 # Source common functions
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-source "$SCRIPT_DIR/common.sh"
+LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$LIB_DIR/common.sh"
 
 # Validate and sanitize directory path
 validate_directory_path() {
@@ -60,24 +60,18 @@ validate_directory_path() {
     echo "$path"
 }
 
-# Validate timezone
+# Validate timezone -- returns the timezone string, defaulting to America/New_York if invalid
 validate_timezone() {
     local timezone="$1"
-    
-    if [[ -z "$timezone" ]]; then
-        error_exit "Timezone cannot be empty"
+    local default="America/New_York"
+
+    if [[ -z "$timezone" ]] || \
+       [[ ! "$timezone" =~ ^[A-Za-z_]+(/[A-Za-z_]+)*$ ]] || \
+       ! timedatectl list-timezones 2>/dev/null | grep -qx "$timezone"; then
+        warning "Timezone '${timezone}' invalid, defaulting to '${default}'"
+        timezone="$default"
     fi
-    
-    # Basic format validation
-    if [[ ! "$timezone" =~ ^[A-Za-z_]+(/[A-Za-z_]+)*$ ]]; then
-        error_exit "Invalid timezone format: $timezone"
-    fi
-    
-    # Check if timezone file exists
-    if [[ ! -f "/usr/share/zoneinfo/$timezone" ]]; then
-        error_exit "Unknown timezone: $timezone"
-    fi
-    
+
     echo "$timezone"
 }