Switch from metaclaw-memory to claude-memory-mcp plugin

- Disable metaclaw-memory plugin, add claude-memory-mcp hooks and env vars
- Add ~/.mcp.json with claude_memory MCP server config
- Add MEMORY_API_KEY/MEMORY_API_URL env vars alongside CLAUDE_MEMORY_* aliases

dot_mcp.json

@@ -0,0 +1,14 @@
+{
+  "mcpServers": {
+    "claude_memory": {
+      "type": "stdio",
+      "command": "python3",
+      "args": ["/Users/viktorbarzin/code/claude-memory-mcp/src/claude_memory/mcp_server.py"],
+      "env": {
+        "MEMORY_API_URL": "https://claude-memory.viktorbarzin.me",
+        "MEMORY_API_KEY": "REDACTED_ROTATED_KEY",
+        "PYTHONPATH": "/Users/viktorbarzin/code/claude-memory-mcp/src"
+      }
+    }
+  }
+}