Qarinah 0.1.6 gives Codex, Claude Code, Cursor, CLI tools, and compatible MCP clients one local, cited project memory. Published six-fixture estimate: 442,113 full-history tokens vs 5,682 Qarinah tokens—98.71% less repeated context and a 77.81:1 ratio, with every required target top-five. At a flat $3/M uncached input rate, the compared slice is $1.326339 vs $0.017046, an estimated $1.309293 saving per repeat. Apache-2.0, local-first; not a provider bill or universal guarantee.