Add Serena MCP server config

Wires Serena (https://github.com/oraios/serena) as an MCP server for
Claude Code sessions in this repo. Provides symbol-level code navigation
via language servers, complementing grep-based search.

Runs via uvx with --project "." so it picks up whatever clone of the
repo Claude is launched from (works for human checkouts and Clayde's
transient clones alike).

Author: MagicMock/mock.effective_git_name/130407769905136

.mcp.json

@@ -0,0 +1,17 @@
+{
+  "mcpServers": {
+    "serena": {
+      "command": "uvx",
+      "args": [
+        "--from",
+        "git+https://github.com/oraios/serena",
+        "serena",
+        "start-mcp-server",
+        "--context",
+        "ide-assistant",
+        "--project",
+        "."
+      ]
+    }
+  }
+}