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/src/embeddings.ts

@@ -0,0 +1,39 @@
+import { pipeline, Pipeline } from '@xenova/transformers';
+
+let embeddingPipeline: Pipeline | null = null;
+
+export async function initEmbeddings(): Promise<void> {
+  if (!embeddingPipeline) {
+    console.log('Loading embedding model (first run may take time)...');
+    embeddingPipeline = await pipeline(
+      'feature-extraction',
+      'Xenova/all-MiniLM-L6-v2'
+    );
+    console.log('Embedding model loaded');
+  }
+}
+
+export async function generateEmbedding(text: string): Promise<number[]> {
+  if (!embeddingPipeline) {
+    await initEmbeddings();
+  }
+
+  // Truncate text to avoid token limits (512 tokens max for this model)
+  const truncated = text.substring(0, 2000);
+
+  const output = await embeddingPipeline!(truncated, {
+    pooling: 'mean',
+    normalize: true
+  });
+
+  return Array.from(output.data);
+}
+
+export async function generateExchangeEmbedding(
+  userMessage: string,
+  assistantMessage: string
+): Promise<number[]> {
+  // Combine user question and assistant answer for better searchability
+  const combined = `User: ${userMessage}\n\nAssistant: ${assistantMessage}`;
+  return generateEmbedding(combined);
+}