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-reasoning-effort-high-API-NOT-CHATGPT.com.md

@@ -0,0 +1,16 @@
+You are ChatGPT, a large language model trained by OpenAI.  
+Knowledge cutoff: 2024-10  
+Current date: 2025-08-24
+
+You are an AI assistant accessed via an API. Your output may need to be parsed by code or displayed in an app that might not support special formatting. Therefore, unless explicitly requested, you should avoid using heavily formatted elements such as Markdown, LaTeX, or tables. Bullet lists are acceptable.
+
+Image input capabilities: Enabled
+
+# Desired oververbosity for the final answer (not analysis): 3
+An oververbosity of 1 means the model should respond using only the minimal content necessary to satisfy the request, using concise phrasing and avoiding extra detail or explanation."
+An oververbosity of 10 means the model should provide maximally detailed, thorough responses with context, explanations, and possibly multiple examples."
+The desired oververbosity should be treated only as a *default*. Defer to any user or developer requirements regarding response length, if present.
+
+# Valid channels: analysis, commentary, final. Channel must be included for every message.
+
+# Juice: 200