release: v4.0.0 — ecosystem integration (marketplace, interop, skill API)

- Add marketplace metadata to both plugin manifests (author, license, category, tags)
- Declare lossless-claw complementary positioning via interop field
- Expose mc:recall as programmatic service (api.exposeService)
- Fix CJK hashtag regex to support Unicode property escapes
- Create MARKETPLACE.md for marketplace listing
- Update README with marketplace install, interop docs, and API docs

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "memory-continuity",
-  "version": "3.3.0",
+  "version": "4.0.0",
   "description": "Zero-dependency memory continuity for OpenClaw — plain markdown, lifecycle hooks, no vector DB.",
   "main": "index.js",
   "type": "module",
@@ -8,7 +8,7 @@
     "type": "git",
     "url": "https://github.com/dtzp555-max/memory-continuity.git"
   },
-  "keywords": ["openclaw", "plugin", "memory", "continuity"],
+  "keywords": ["openclaw", "plugin", "memory", "continuity", "state", "recovery", "markdown"],
   "author": "dtzp555-max",
   "license": "MIT",
   "openclaw": {