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>

mc-plugin/package.json

@@ -1,10 +1,10 @@
 {
   "name": "mc-plugin",
-  "version": "1.0.0",
+  "version": "2.0.0",
   "description": "Slash commands for Memory Continuity — /mc state, /mc history, /mc search, etc.",
   "main": "index.js",
   "type": "module",
-  "keywords": ["openclaw", "plugin", "memory", "continuity"],
+  "keywords": ["openclaw", "plugin", "memory", "continuity", "commands"],
   "license": "MIT",
   "openclaw": {
     "type": "plugin",