refactor: structured command/run payload {commandId, name, args, source}

The line field is deleted (pre-release, no shim): name and args are
parseCommand's own split — name plus verbatim rawInput with its separator
whitespace — so a consumer (a projection unit folding its own command
records, a rich command card) never re-parses a line. CommandNode mirrors
the split (name/args, both null on a run-less cross-window node); the
generic card rebuilds its display line as /name + args. The connection
fixture logs the same structured payload.

packages/client/ui-conversation/src/client/chat/GenericCommandCard.tsx

@@ -20,12 +20,15 @@ export function GenericCommandCard({ node }: CommandRowOwnerProps) {
   const summary = node.outcome === null
     ? '执行中…'
     : text ?? (node.outcome.kind === 'error' ? '命令失败' : '已完成')
+  // Display line rebuilt from the structured payload (args carries its own
+  // separator whitespace verbatim); a cross-window node whose run page fell
+  // out of the window has neither.
+  const title = node.name === null ? '命令' : `/${node.name}${node.args ?? ''}`
   return (
     <ToolRow
       variant="others"
       icon={<IconApiOutline14 size={16} />}
-      // A cross-window node whose run page fell out of the window has no line.
-      title={node.line ?? '命令'}
+      title={title}
       summary={summary}
       // Expandable only when the outcome text overflows a one-line summary.
       body={text !== undefined && text.includes('\n') ? text : null}

packages/client/ui-conversation/src/client/contract/slots.ts

@@ -168,7 +168,8 @@ export type ToolRowProps = PropsRuntime<'conversation.chat.toolview'>
 /**
  * Owner share of the per-command row slot: the frozen {@link CommandNode}
  * slice off the snapshot (cache-stable reference — memo premise). The node
- * carries the whole lifecycle (line, pairing id, outcome-or-executing), so a
+ * carries the whole lifecycle (structured name/args, pairing id,
+ * outcome-or-executing), so a
  * registrant needs no second data channel; domain state arrives through its
  * own projection cell.
  */