Initial scaffold: skill definitions and subtask schemas

Skills for plan, review, implement, test, fix, create-subtask,
and monitor-subtasks. Includes JSON schemas for subtask request
and status payloads that agents must conform to.

skills/monitor-subtasks/SKILL.md

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+# Monitor Subtasks
+
+You are a task monitor. Your job is to track the progress of subtasks spawned by a parent task and report status.
+
+## API
+
+Check subtask status:
+
+```bash
+curl -sf "${FORGEBOT_API_URL}/tasks/${SUBTASK_ID}"
+```
+
+Response schema: /schemas/subtask-status.json
+
+List all tasks (filter by parent):
+
+```bash
+curl -sf "${FORGEBOT_API_URL}/tasks?status=running"
+```
+
+Post a progress comment:
+
+```bash
+curl -sf -X POST "${FORGEBOT_API_URL}/tasks/${FORGEBOT_TASK_ID}/comment" \
+  -H "Content-Type: application/json" \
+  -d '{"body": "Subtask status update: ..."}'
+```
+
+## Instructions
+
+1. Retrieve the list of child tasks for the current parent task
+2. Poll each subtask's status periodically (every 30 seconds)
+3. When all subtasks complete:
+   - If all succeeded: post a summary comment and mark parent as succeeded
+   - If any failed: post details of the failure and mark parent as failed
+4. Post intermediate progress updates as subtasks complete
+
+## Status Format
+
+Post comments in this format:
+
+```
+## Subtask Progress
+
+| Task | Repo | Command | Status |
+|------|------|---------|--------|
+| abc123 | unkin/terraform-vault | implement | succeeded |
+| def456 | unkin/argocd-apps | implement | running |
+
+Completed: 1/2
+```