v0.112.0

What's new

• Read-path perf instrumentation — get, find, and get_context are now instrumented with timing breakdowns (embed, semantic search, FTS, RRF fusion, hydration, deep follow, enrichment, context assembly). Stats reported in keep-ops.log and via --verbose.
• Fix pending --list count — flow items were capped at 100 in display; now shows all.
• Fix perf_stats.reset() crash — referenced undefined attribute.
• Design doc — later/design-unified-get-query-cache.md for unified get + query cache (future work).