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

skills/community/picoclaw/github/SKILL.md

@@ -0,0 +1,48 @@
+---
+name: github
+description: "Interact with GitHub using the `gh` CLI. Use `gh issue`, `gh pr`, `gh run`, and `gh api` for issues, PRs, CI runs, and advanced queries."
+metadata: {"nanobot":{"emoji":"🐙","requires":{"bins":["gh"]},"install":[{"id":"brew","kind":"brew","formula":"gh","bins":["gh"],"label":"Install GitHub CLI (brew)"},{"id":"apt","kind":"apt","package":"gh","bins":["gh"],"label":"Install GitHub CLI (apt)"}]}}
+---
+
+# GitHub Skill
+
+Use the `gh` CLI to interact with GitHub. Always specify `--repo owner/repo` when not in a git directory, or use URLs directly.
+
+## Pull Requests
+
+Check CI status on a PR:
+```bash
+gh pr checks 55 --repo owner/repo
+```
+
+List recent workflow runs:
+```bash
+gh run list --repo owner/repo --limit 10
+```
+
+View a run and see which steps failed:
+```bash
+gh run view <run-id> --repo owner/repo
+```
+
+View logs for failed steps only:
+```bash
+gh run view <run-id> --repo owner/repo --log-failed
+```
+
+## API for Advanced Queries
+
+The `gh api` command is useful for accessing data not available through other subcommands.
+
+Get PR with specific fields:
+```bash
+gh api repos/owner/repo/pulls/55 --jq '.title, .state, .user.login'
+```
+
+## JSON Output
+
+Most commands support `--json` for structured output.  You can use `--jq` to filter:
+
+```bash
+gh issue list --repo owner/repo --json number,title --jq '.[] | "\(.number): \(.title)"'
+```