AI coding agents have amnesia. They solve the same bugs repeatedly, forgetting hard-won knowledge the moment the session ends. PeKG is a cross-project knowledge graph that agents query via MCP. No prompts to write — the agent captures decisions, patterns, and gotchas as you work, compiles them into searchable wiki articles, and surfaces relevant blockers before you hit them again. BYOLLM: Your agent does the synthesis. PeKG owns the graph. You keep control of your data and tokens.