docs: refresh README, roadmap, and workflow templates (#624)

README.md

@@ -33,7 +33,8 @@ Open source, multi-provider, no telemetry, not tied to any cloud.
 - **Parallel task execution** – start and manage multiple tasks from different sources simultaneously, boosting productivity with AI agents
 - **Integrated workspace** - Built-in terminal, code editor with LSP, git changes panel, embedded vscode and chat in one IDE-like view
 - **Kanban task management** - Drag-and-drop boards, columns, and workflow automation
-- **Agentic workflows** - Multi-step pipelines that chain agents through automated task routing. See [docs/workflows.md](docs/workflow-tips.md)
+- **Agentic workflows** - Multi-step pipelines that mix-and-match agents per step - for example, Claude Code Opus to design a plan, GitHub Copilot Sonnet to implement it, and Codex GPT 5.4 to review the changes. See [docs/workflows.md](docs/workflow-tips.md)
+- **Sub-tasks** - Agents can spawn sub-tasks that resume from the parent task's session. Useful for splitting a task that has grown too big, or producing several PRs from the same starting point.
 - **CLI passthrough** - Drop into raw agent CLI mode for direct terminal interaction with any supported agent, leverage the full power of their TUIs
 - **Workspace isolation** - Git worktrees prevent concurrent agents from conflicting
 - **Flexible runtimes** - Run agents as local processes, in isolated Docker containers or in remote executors like sprites.dev