refactor(opencode): native SDK tools, drop MCP, trim skills, expand telemetry

Reworks @mem0/opencode-plugin to expose memory operations as native OpenCode
tools (via the @opencode-ai/plugin `tool()` helper, backed by the mem0ai SDK)
instead of delegating to the remote MCP server. Skills load via the `config`
hook (`skills.paths`) instead of being copied into the project `.opencode/`.

- Drop MCP: remove the regex-based MCP tool interception, the bundled
  opencode.json MCP registration, and the cli.ts installer (mem0-opencode bin).
- Native tools: add_memory, search_memories, get_memories, get_memory,
  update_memory, delete_memory, delete_all_memories, delete_entities,
  list_entities, get_event_status.
- Trim skills 16 -> 8 (context-loader, dream, forget, health, peek, pin,
  remember, tour); remove import, export, memory-reviewer, mem0, list-projects,
  switch-project, stats, onboard. De-MCP/onboard wording in kept skills.
- Telemetry: emit the full shared plugin.* schema (adds user_prompt, bash_error,
  pre_compact, session_stop alongside session_start, tool_use); tool_use now
  fires from inside each native tool; add project_hash + os_version props.
- Fix duplicate error-search (single topK:6); correct the documented
  experimental.chat.messages.transform hook name.
- Bump to 0.2.0.

integrations/mem0-plugin/.opencode-plugin/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mem0/opencode-plugin",
-  "version": "0.1.3",
+  "version": "0.2.0",
   "type": "module",
   "description": "Mem0 persistent memory plugin for OpenCode — add, search, and manage memories across sessions",
   "main": "dist/index.js",
@@ -11,9 +11,6 @@
       "import": "./dist/index.js"
     }
   },
-  "bin": {
-    "mem0-opencode": "./cli.ts"
-  },
   "publishConfig": {
     "access": "public"
   },
@@ -23,7 +20,6 @@
     "opencode-plugin",
     "mem0",
     "memory",
-    "mcp",
     "ai-memory",
     "persistent-memory"
   ],
@@ -34,8 +30,6 @@
   },
   "files": [
     "dist",
-    "cli.ts",
-    "opencode.json",
     "LICENSE",
     "opencode-skills"
   ],
@@ -49,6 +43,7 @@
   "opencode": {
     "type": "plugin",
     "hooks": [
+      "config",
       "chat.message",
       "tool.execute.before",
       "tool.execute.after",