Add community skills, agents, system prompts from 22+ sources

Community Skills (32):
- jat: jat-start, jat-verify, jat-complete
- pi-mono: codex-cli, codex-5.3-prompting, interactive-shell
- picoclaw: github, weather, tmux, summarize, skill-creator
- dyad: 18 skills (swarm-to-plan, multi-pr-review, fix-issue, lint, etc.)
- dexter: dcf valuation skill

Agents (23):
- pi-mono subagents: scout, planner, reviewer, worker
- toad: 19 agent configs (Claude, Codex, Gemini, Copilot, OpenCode, etc.)

System Prompts (91):
- Anthropic: 15 Claude prompts (opus-4.6, code, cowork, etc.)
- OpenAI: 49 GPT prompts (gpt-5 series, o3, o4-mini, tools)
- Google: 13 Gemini prompts (2.5-pro, 3-pro, workspace, cli)
- xAI: 5 Grok prompts
- Other: 9 misc prompts (Notion, Raycast, Warp, Kagi, etc.)

Hooks (9):
- JAT hooks for session management, signal tracking, activity logging

Prompts (6):
- pi-mono templates for PR review, issue analysis, changelog audit

Sources analyzed: jat, ralph-desktop, toad, pi-mono, cmux, pi-interactive-shell,
craft-agents-oss, dexter, picoclaw, dyad, system_prompts_leaks, Prometheus,
zed, clawdbot, OS-Copilot, and more

agents/community/toad/openhands.dev.toml

@@ -0,0 +1,45 @@
+# Schema defined in agent_schema.py
+# https://www.claude.com/product/claude-code
+
+identity = "openhands.dev"
+name = "OpenHands"
+short_name = "openhands"
+url = "https://openhands.dev/"
+protocol = "acp"
+author_name = "OpenHands"
+author_url = "https://openhands.dev/"
+publisher_name = "Will McGugan"
+publisher_url = "https://willmcgugan.github.io/"
+type = "coding"
+description = "The open platform for cloud coding agents. Scale from one to thousands of agents — open source, model-agnostic, and enterprise-ready. New users get [$text-success bold]$10[/] in free OpenHands Cloud credits!"
+tags = []
+run_command."*" = "openhands acp"
+recommended = true
+
+help = '''
+# OpenHands
+
+The open platform for cloud coding agents
+
+Scale from one to thousands of agents -- open source, model agnostic, and enterprise-ready.
+
+[openhands-dev](https://openhands.dev/)
+'''
+
+welcome = '''
+## The future of software development must be written by engineers
+
+Software development is changing. That change needs to happen in the open, driven by a community of professional developers. That's why OpenHands' software agent is MIT-licensed and trusted by a growing community.
+
+Visit [openhands-dev](https://openhands.dev/) for more information.
+'''
+
+[actions."*".install]
+command = "uv tool install openhands -U --python 3.12 && openhands login"
+bootstrap_uv = true
+description = "Install OpenHands"
+
+[actions."*".update]
+command = "uv tool install openhands -U --python 3.12"
+bootstrap_uv = true
+description = "Update OpenHands"