pgvector long-term memory

Most Laravel AI tutorials treat every request as stateless. That works for single-turn completions. It fails for agentic systems where the agent needs to recall what it did three tool calls ago, what the user said last Tuesday, and what decisions were made in a previous session. This guide builds a three-layer Laravel AI agent memory system using Eloquent for conversation history, Redis for working session state, and pgvector for semantic long-term recall.