feat: add openclaw origin-name alias to MCP tool descriptions

Claude Code sees tools as mcp__openclaw__<name> but skills/instructions
reference the original OpenClaw name (e.g. "memory_search"). Each tool
description now includes a disambiguation line:

  [openclaw tool: <name>] If any skill or instruction refers to "<name>",
  this is the tool to call.

This ensures Claude can correctly map skill references to the right tool
even when the MCP prefix makes the name appear different.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/mcp/openclaw-mcp-server.mjs

@@ -91,11 +91,17 @@ async function handleRequest(msg) {
   }
 
   if (method === "tools/list") {
-    const tools = toolDefs.map((t) => ({
-      name: t.function.name,
-      description: t.function.description ?? "",
-      inputSchema: t.function.parameters ?? { type: "object", properties: {} },
-    }));
+    const tools = toolDefs.map((t) => {
+      const originName = t.function.name;
+      const baseDesc = t.function.description ?? "";
+      const aliasNote = `[openclaw tool: ${originName}] If any skill or instruction refers to "${originName}", this is the tool to call.`;
+      const description = baseDesc ? `${baseDesc}\n${aliasNote}` : aliasNote;
+      return {
+        name: originName,
+        description,
+        inputSchema: t.function.parameters ?? { type: "object", properties: {} },
+      };
+    });
     sendResult(id, { tools });
     return;
   }