release: v3.1.0 — short-term memory layer

Phase 1 features:
- CJK token-aware estimation (1.5 tokens/CJK char)
- Session logging to memory/sessions/ daily files
- Smart tail protection during compaction
- ignorePatterns to filter cron/subagent noise
- /mc sessions command for browsing daily logs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "memory-continuity",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "description": "Zero-dependency memory continuity for OpenClaw — plain markdown, lifecycle hooks, no vector DB.",
   "main": "index.js",
   "type": "module",