forked from cardosofelipe/pragma-stack
Add comprehensive metrics collector for memory system with: - Counter metrics: operations, retrievals, cache hits/misses, consolidations, episodes recorded, patterns/anomalies/insights detected - Gauge metrics: item counts, memory size, cache size, procedure success rates, active sessions, pending consolidations - Histogram metrics: working memory latency, retrieval latency, consolidation duration, embedding latency - Prometheus format export - Summary and cache stats helpers 31 tests covering all metric types, singleton pattern, and edge cases.