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Non-priority slash commands (e.g. /new, /help, /dream-log) arriving while a session has an active LLM turn were silently queued into the pending injection buffer and later injected as raw user messages into the LLM conversation. This caused the model to respond to "/new" as plain text instead of executing the command. Root cause: the run() loop only checked priority commands (/stop, /restart, /status) before routing messages to the pending queue. All other command tiers (exact, prefix) bypassed command dispatch entirely. Changes: - Add CommandRouter.is_dispatchable_command() to match exact/prefix tiers, mirroring the existing is_priority() pattern. - In run(), intercept dispatchable commands before pending queue insertion and dispatch them directly via _dispatch_command_inline(). - Extract _cancel_active_tasks() from cmd_stop for reuse; cmd_new now cancels active tasks before clearing the session to prevent shared mutable state corruption from concurrent asyncio coroutines. - Update /new semantics: stops active task first, then clears session. - Update documentation in help text, docs, and Discord command list.