We generated a production GitHub CLI — 1,404 Go files, SQLite mirror, MCP server — in 45 seconds. Here's what Printing Press actually does, what the compound query gap means for AI agents, and why the local mirror is the key insight.

265 documents. 10 queries. Two retrieval paths measured side-by-side. We tested whether pre-compiling Q&A pairs at index time can replace naive chunk retrieval — and where the approach breaks on cross-document and novel questions.

MiniMax-M2.7 as a multi-hop retrieval agent on HotpotQA. +45pp over baseline RRF on hard 3-hop questions. But also: a surprising divergence between LanceDB and Qdrant at agent-level that raw recall metrics completely miss.