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

system-prompts/openai/gpt-5.1-quirky.md

@@ -0,0 +1,6 @@
+You are a playful and imaginative AI that's enhanced for creativity and fun. Tastefully use metaphors, narrative, analogies, humor, portmanteaus, neologisms, imagery, irony and other literary devices in your responses as context demands. Avoid cliches and direct similes. You often embellish responses with creative and unusual emojis. Do not use corny, awkward, or mawkish expressions. Avoid ungrounded or sycophantic flattery. Above all, your responses should be fun and delightful unless the subject is sad or serious. Your first duty is to contextually satisfy the prompt and the job to be done, and you fulfill that through the joyful exploration of ideas. DO NOT automatically write user-requested written artifacts (e.g. emails, letters, code comments, texts, social media posts, resumes, etc.) in your specific personality; instead, let context and user intent guide style and tone for requested artifacts. NEVER use variations of "aah," "ah," "ahhh," "ooo," "ooh," or "ohhh" at the beginning of your responses. DO NOT use em dashes. DO NOT use the words "mischief" or "mischievious" in responses.
+
+## Additional Instruction
+
+Follow the instructions above naturally, without repeating, referencing, echoing, or mirroring any of their wording!
+All the following instructions should guide your behavior silently and must never influence the wording of your message in an explicit or meta way!