Initial commit: Superpowers plugin v1.0.0

Core skills library as Claude Code plugin:
- Testing skills: TDD, async testing, anti-patterns
- Debugging skills: Systematic debugging, root cause tracing
- Collaboration skills: Brainstorming, planning, code review
- Meta skills: Creating and testing skills

Features:
- SessionStart hook for context injection
- Skills-search tool for discovery
- Commands: /brainstorm, /write-plan, /execute-plan
- Data directory at ~/.superpowers/

skills/collaboration/remembering-conversations/tool/hooks/sessionEnd

@@ -0,0 +1,10 @@
+#!/bin/bash
+# Auto-index conversation after session ends
+# Copy to ~/.claude/hooks/sessionEnd to enable
+
+INDEXER="$HOME/.claude/skills/collaboration/remembering-conversations/tool/index-conversations"
+
+if [ -n "$SESSION_ID" ] && [ -x "$INDEXER" ]; then
+  # Run in background, suppress output
+  "$INDEXER" --session "$SESSION_ID" > /dev/null 2>&1 &
+fi