Reorganize: Move all skills to skills/ folder

- Created skills/ directory
- Moved 272 skills to skills/ subfolder
- Kept agents/ at root level
- Kept installation scripts and docs at root level

Repository structure:
- skills/           - All 272 skills from skills.sh
- agents/           - Agent definitions
- *.sh, *.ps1       - Installation scripts
- README.md, etc.   - Documentation

Co-Authored-By: Claude <noreply@anthropic.com>

hooks/session-start-superpowers.sh

@@ -1,15 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-# Read skill files and inject into session context
-auto_superpowers_content=$(cat "${HOME}/.claude/skills/auto-superpowers/SKILL.md" 2>/dev/null || echo "Skill not found")
-using_superpowers_content=$(cat "${HOME}/.claude/skills/using-superpowers/SKILL.md" 2>/dev/null || echo "Skill not found")
-
-# Output JSON with skills injected
-cat <<EOF
-{
-  "hookSpecificOutput": {
-    "hookEventName": "SessionStart",
-    "additionalContext": "\n**AUTO-SUPERPOWERS IS ACTIVE**\n\n${auto_superpowers_content}\n\n**USING-SUPERPOWERS INSTRUCTION:**\n\n${using_superpowers_content}\n\n"
-  }
-}