docs: add subtask2 to ecosystem page (anomalyco#6704)

Author: spoons-and-mirrors

packages/web/src/content/docs/ecosystem.mdx

@@ -38,6 +38,7 @@ You can also check out [awesome-opencode](https://github.com/awesome-opencode/aw
 | [opencode-skillful](https://github.com/zenobi-us/opencode-skillful)                                | Allow OpenCode agents to lazy load prompts on demand with skill discovery and injection        |
 | [opencode-supermemory](https://github.com/supermemoryai/opencode-supermemory)                      | Persistent memory across sessions using Supermemory                                            |
 | [@plannotator/opencode](https://github.com/backnotprop/plannotator/tree/main/apps/opencode-plugin) | Interactive plan review with visual annotation and private/offline sharing                     |
+| [@openspoon/subtask2](https://github.com/spoons-and-mirrors/subtask2)                              | Extend opencode /commands into a powerful orchestration system with granular flow control      |
 
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