openspec-apply-changelisted

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 `openspec list --json` 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., `/opsx:apply <other>`). 2. **Check status to understand the schema** ```bash openspec status --change "<name>" --json ``` Parse the JSON to understand: - `schemaName`: The workflow being used (e.g., "spec-driven") - Which artifact contains the tasks (typically "tasks" for spec-driven, check status for others) 3. **Get apply instructions** ```bash openspec instructions apply --change "<name>" --json ``` This returns: - Context file paths (varies by schema - could be proposal/specs/design/tasks or spec/tests/implementation/docs) - Progress (total, complete, remaining) - Task list with status - Dynamic instruction based on current state **Handle states:** - If `state: "blocked"` (missing artifacts): show message, suggest using openspec-continue-change - If `state: "all_done"`: congratulate, suggest archive - Othe