pub fn parse_manual_placeholders(session: &Session) -> Vec<Parameter>Expand description
Parse manual {{VAR_NAME}} placeholders from command strings.
Scans all commands for {{VAR_NAME}} patterns. Returns a Parameter
for each unique placeholder name found, skipping names that match
auto-detected parameter names (HOME_DIR, USERNAME, HOSTNAME).
ยงPanics
Panics if the internal regex pattern is invalid (should never happen).