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/copilot.github.com.toml

@@ -0,0 +1,29 @@
+# Schema defined in agent_schema.py
+# https://github.com/github/copilot-cli?locale=en-US
+
+identity = "copilot.github.com"
+name = "Copilot"
+short_name = "copilot"
+url = "https://github.com/github/copilot-cli"
+protocol = "acp"
+author_name = "GitHub"
+author_url = "https://githib.com"
+publisher_name = "Will McGugan"
+publisher_url = "https://willmcgugan.github.io/"
+type = "coding"
+description = "The power of GitHub Copilot, now in your terminal."
+tags = []
+run_command."*" = "copilot --acp"
+
+help = '''
+# GitHub Copilot
+
+GitHub Copilot CLI brings AI-powered coding assistanc"e directly to your command line, enabling you to build, debug, and understand code through natural language conversations. Powered by the same agentic harness as GitHub's Copilot coding agent, it provides intelligent assistance while staying deeply integrated with your GitHub workflow.
+
+Install vial the select below, or see the README for [alternative install methods](https://github.com/github/copilot-cli?tab=readme-ov-file#installation)
+
+'''
+
+[actions."*".install]
+command = "npm install -g @github/copilot@prerelease"
+description = "Install Copilot"