chore: remove 4 dead functions from lib/common.sh

get_repo_list() — never called, scripts use read -ra directly
wait_for_ssh() — never called, scripts use ssh_check
validate_optional() — never called, optional type unused in arrays
manifest_exists() — never called

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

lib/common.sh

@@ -123,15 +123,6 @@ require_vars() {
   done
 }
 
-# Split REPO_NAMES (space-delimited) into one name per line.
-# Usage:  while IFS= read -r repo; do ...; done < <(get_repo_list)
-#    or:  read -ra REPOS <<< "$REPO_NAMES"   (for array-style usage)
-get_repo_list() {
-  local repos=()
-  read -ra repos <<< "${REPO_NAMES:-}"
-  printf '%s\n' "${repos[@]}"
-}
-
 # ---------------------------------------------------------------------------
 # .env value validators — shared by configure_env.sh, preflight.sh,
 # bitwarden_to_env.sh. Each returns 0 (valid) or 1 (invalid).
@@ -185,10 +176,6 @@ validate_positive_integer() {
   [[ "$1" =~ ^[1-9][0-9]*$ ]]
 }
 
-validate_optional() {
-  return 0  # always valid — value can be empty or anything
-}
-
 validate_optional_path() {
   # shellcheck disable=SC2088  # tilde intentionally stored as literal string
   [[ -z "$1" ]] || [[ "$1" == /* ]] || [[ "$1" == "~/"* ]]
@@ -633,24 +620,6 @@ wait_for_http() {
   return 1
 }
 
-wait_for_ssh() {
-  local host_key="$1" max_secs="${2:-60}"
-  local elapsed=0
-
-  log_info "Waiting for SSH to ${host_key} (timeout: ${max_secs}s)..."
-  while [[ $elapsed -lt $max_secs ]]; do
-    if ssh_check "$host_key"; then
-      log_success "SSH to ${host_key} connected (after ${elapsed}s)"
-      return 0
-    fi
-    sleep 2
-    elapsed=$((elapsed + 2))
-  done
-
-  log_error "Timeout waiting for SSH to ${host_key} after ${max_secs}s"
-  return 1
-}
-
 # ---------------------------------------------------------------------------
 # Version checking
 # ---------------------------------------------------------------------------
@@ -931,15 +900,6 @@ manifest_record() {
   printf '%s\n' "$entry" >> "$file"
 }
 
-# Check if a manifest file exists and has entries (beyond the header).
-# Usage: manifest_exists "macbook"
-manifest_exists() {
-  local host="$1"
-  local file
-  file="$(_manifest_dir)/${host}.manifest"
-  [[ -f "$file" ]] && grep -qv '^#' "$file" 2>/dev/null
-}
-
 # Read all entries from a manifest (skipping comments).
 # Usage: manifest_entries "macbook"
 # Outputs lines to stdout: TYPE|TARGET|DETAILS