Implement tasks from an OpenSpec change. Input : Optionally specify a change name. If omitted, check if it can be inferred from conversation context. If vague or ambiguous you MUST prompt for available changes. Steps 1. Select the change If a name is provided, use it. Otherwise: - Infer from conversation context if the user mentioned a change - Auto-select if only one active change exists - If ambiguous, run to get available changes and use the AskUserQuestion tool to let the user select Always announce: "Using change: <name " and how to override (e.g., ). 2. Check status to understand the sc…