fix(mcp): keep codegraph_explore loaded in Claude Code and Copilot CLI (#1696)

Claude Code defers every MCP tool behind ToolSearch by default, so a fresh session sees only the tool name until the model searches for it. The explore tool now carries `_meta: { "anthropic/alwaysLoad": true }`, which exempts it on existing installs, and the Claude Code installer target writes `alwaysLoad: true` on the server entry (re-running install adds the key to an older entry). Copilot CLI tool search holds MCP tools back the same way once ~30 tools are connected, so its entry carries `deferTools: "never"`.

README.md

@@ -508,12 +508,15 @@ npm install -g @colbymchenry/codegraph
     "codegraph": {
       "type": "stdio",
       "command": "codegraph",
-      "args": ["serve", "--mcp"]
+      "args": ["serve", "--mcp"],
+      "alwaysLoad": true
     }
   }
 }
 ```
 
+`alwaysLoad` keeps `codegraph_explore` loaded from the first prompt. Claude Code otherwise defers every MCP tool behind a tool-search step, so a fresh session sees only the tool's name until the model searches for it.
+
 **Add to `~/.claude/settings.json` (optional, for auto-allow):**
 ```json
 {