refactor(installer): remove sqlite3 CLI false dependency and verify py-sqlite3 module check

scripts/install_mam.sh

@@ -83,7 +83,7 @@ fi
 
 # 1. Dependency Checks
 log_info "Verifying host dependencies..."
-DEPS=(tmux python3 sqlite3 rsync uuidgen)
+DEPS=(tmux python3 rsync uuidgen)
 MISSING_DEPS=()
 for dep in "${DEPS[@]}"; do
   if ! command -v "$dep" &>/dev/null; then
@@ -97,9 +97,9 @@ if [ ${#MISSING_DEPS[@]} -ne 0 ]; then
   exit 1
 fi
 
-# Check Python PyYAML library (hard dependency for YAML registry parsing)
-if ! python3 -c "import yaml" &>/dev/null; then
-  log_error "Python 'pyyaml' package is not installed (hard dependency for session registry)."
+# Check Python PyYAML and sqlite3 library (hard dependencies for registry parsing)
+if ! python3 -c "import yaml, sqlite3" &>/dev/null; then
+  log_error "Python 'pyyaml' or built-in 'sqlite3' modules are missing (hard dependencies for session registry)."
   log_error "Please run: pip install pyyaml"
   exit 1
 fi