holix-sdd-apply

## When to use User says implement / apply / do the change after a proposal exists under `openspec/changes/<id>/`. ## Mandatory pre-apply gate **Before any product code:** 1. `sdd_status` with `change_id` — must be `apply_ready` 2. `sdd_request_apply_mode` — get the question 3. **Ask the user in chat** (show the prompt): - **self** — main agent does all tasks - **subagents** — dispatch by assignee (`main` stays on main) - **hybrid** — strictly follow each assignee 4. Wait for the answer. Then `sdd_set_apply_mode` with `self` | `subagents` | `hybrid` 5. `sdd_apply` — only proceeds if mode is set; returns plan (task → executor). For **subagents/hybrid** it **auto-dispatches** using the **exact assignee** from `tasks.md` (e.g. `coder-python`). If mode is missing, `sdd_apply` fails on purpose. **Do not start coding.** ## Implement 1. Follow the plan from `sdd_apply` only; respect delta specs 2. Mode **self**: you execute every task (ignore assignees; do not spawn subagents) 3. Mode **subagents** / **hybrid**: trust auto-dispatch / `sdd_dispatch` job ids — they use **tasks.md assignee** (custom types). Same type → `type-1`, `type-2`, … in parallel. Then `wait_subagent_result`; do `main` tasks yourself. **Successful subagent jobs auto-mark their task checkbox** in `tasks.md` — you do not need `sdd_check_task` for those. Still call `sdd_check_task` for **main** tasks and if auto-mark failed. 4. After each **main** task: `sdd_check_task` 5. When all ...