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/dyad/fix-issue/scripts/sanitize_issue_markdown.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+"""
+Sanitize GitHub issue markdown by removing comments, unusual formatting,
+and other artifacts that may confuse LLMs processing the issue.
+"""
+
+import re
+import sys
+
+
+def sanitize_issue_markdown(markdown: str) -> str:
+    """
+    Sanitize GitHub issue markdown content.
+
+    Removes:
+    - HTML comments (<!-- ... -->)
+    - Zero-width characters and other invisible Unicode
+    - Excessive blank lines (more than 2 consecutive)
+    - Leading/trailing whitespace on each line
+    - HTML tags that aren't useful for understanding content
+    - GitHub-specific directives that aren't content
+
+    Args:
+        markdown: Raw markdown string from GitHub issue
+
+    Returns:
+        Cleaned markdown string
+    """
+    result = markdown
+
+    # Remove HTML comments (including multi-line)
+    result = re.sub(r"<!--[\s\S]*?-->", "", result)
+
+    # Remove zero-width characters and other invisible Unicode
+    # (Zero-width space, non-joiner, joiner, word joiner, no-break space, etc.)
+    result = re.sub(
+        r"[\u200b\u200c\u200d\u2060\ufeff\u00ad\u034f\u061c\u180e]", "", result
+    )
+
+    # Remove other control characters (except newlines, tabs)
+    result = re.sub(r"[\x00-\x08\x0b\x0c\x0e-\x1f\x7f]", "", result)
+
+    # Remove HTML details/summary blocks but keep inner content
+    result = re.sub(r"</?(?:details|summary)[^>]*>", "", result, flags=re.IGNORECASE)
+
+    # Remove empty HTML tags
+    result = re.sub(r"<([a-z]+)[^>]*>\s*</\1>", "", result, flags=re.IGNORECASE)
+
+    # Remove GitHub task list markers that are just decoration
+    # But keep the actual checkbox content (supports both [x] and [X])
+    result = re.sub(r"^\s*-\s*\[[ xX]\]\s*$", "", result, flags=re.MULTILINE)
+
+    # Normalize line endings
+    result = result.replace("\r\n", "\n").replace("\r", "\n")
+
+    # Strip trailing whitespace from each line
+    result = "\n".join(line.rstrip() for line in result.split("\n"))
+
+    # Collapse more than 2 consecutive blank lines into 2
+    result = re.sub(r"\n{4,}", "\n\n\n", result)
+
+    # Strip leading/trailing whitespace from the whole document
+    result = result.strip()
+
+    return result
+
+
+def main():
+    """Read from stdin, sanitize, write to stdout."""
+    if len(sys.argv) > 1:
+        # Read from file
+        with open(sys.argv[1], "r", encoding="utf-8") as f:
+            content = f.read()
+    else:
+        # Read from stdin
+        content = sys.stdin.read()
+
+    sanitized = sanitize_issue_markdown(content)
+    print(sanitized)
+
+
+if __name__ == "__main__":
+    main()