Show HN: Paca – Lightweight Jira alternative for human-AI collaboration (github.com) AI

Show HN introduces Paca, an open-source, self-hosted project management platform positioned as a lightweight alternative to Jira/Trello/ClickUp/Monday that lets AI agents participate as “equal teammates” with humans on the same Scrum board and sprints. The project emphasizes configurable workflows via plugins (with a WASM sandbox), a Plan→Act→Check→Adapt collaboration cycle, and features such as in-app AI chat, BDD spec co-authoring, activity diffs/reverts, and an MCP server to connect external AI agents.