VSCode: conversation auto-naming drops skill arguments

Bug Description

When invoking a skill with arguments in the VSCode extension (e.g. /jira-ticket TRI-2888), the conversation name used to include the full input including the argument. Now it only shows the skill name (/jira-ticket) without the argument.

This is a regression — it worked correctly for approximately the past month.

Steps to Reproduce

1. Open Claude Code in VSCode
2. Invoke a skill with an argument, e.g. /jira-ticket TRI-2888
3. Check the conversation name in the history/sidebar

Expected Behavior

Conversation name includes the full input: /jira-ticket TRI-2888

Actual Behavior

Conversation name only shows: /jira-ticket (argument is dropped)

Impact

This makes it impossible to distinguish between conversations started with the same skill but different arguments. For workflows like JIRA ticket investigation where each conversation maps to a specific ticket, this breaks the ability to find and resume past work.

Additional Context

• /rename command does not work in the VSCode extension (see #9198, #15050, #16053)
• There is no other workaround to name conversations in VSCode currently