Slash-command dispatch now splits multi-block input before running policy checks

When you run a slash command, Claude Code now first splits the raw argument text into pieces, checking whether any of them are a distinct "block" (such as a pasted chunk of content). If so, the text and body pieces are rejoined, separated by blank lines and trimmed, and that rejoined text replaces the original argument string before the command's permission checks and the rest of dispatch proceed.