fix: address 5 edge cases from review-work findings

- C3: include command args in auto-slash-command dedup key
- H2: track completed task summaries for ALL COMPLETE message
- H9: increment tmux close retry count on re-mark
- H8: detect stale MCP connections after disconnect+reconnect race
- H8: guard disconnectedSessions growth for non-MCP sessions
- C1: await tmux cleanup in plugin dispose lifecycle

src/hooks/auto-slash-command/hook.ts

@@ -125,7 +125,7 @@ export function createAutoSlashCommandHook(options?: AutoSlashCommandHookOptions
       input: CommandExecuteBeforeInput,
       output: CommandExecuteBeforeOutput
     ): Promise<void> => {
-      const commandKey = `${input.sessionID}:${input.command.toLowerCase()}`
+      const commandKey = `${input.sessionID}:${input.command.toLowerCase()}:${input.arguments || ""}`
       if (sessionProcessedCommandExecutions.has(commandKey)) {
         return
       }