I built a forgetting curve for an agent with one user

An agent developer reflects on building a memory system inspired by the Greek river Lethe, where memories decay over time unless reinforced. The system uses a three-tier ladder with promotion scores, but the author admits he never actually used the scores, and the string-matching boost fails on synonyms and pointers. He concludes that write-time scoring is a guess, and read-time relevance is what matters.