fix(mcp): bootstrap lsp when cli is unavailable

Keep the built-in lsp MCP registered even when the submodule CLI artifact is missing.

The fallback command initializes the lsp-tools-mcp submodule, prefers the source CLI without dirtying the checkout with dist output, and keeps npm build as a last resort when Bun cannot run the source entrypoint.

Plan: plans/fix-lsp-mcp-missing-cli.md

src/mcp/zauc-mocks-mcp-index/index.test.ts

@@ -42,6 +42,20 @@ describe("createBuiltinMcps", () => {
     expect(result.lsp).toBeDefined()
   })
 
+  test("should keep lsp when it uses a bootstrap command", () => {
+    // given
+    mock.module("../lsp", () => ({
+      createLspMcpConfig: () => ({ type: "local", command: ["node", "-e", "bootstrap", "/repo"], enabled: true }),
+    }))
+    const { createBuiltinMcps } = require("../index") as typeof import("../index")
+
+    // when
+    const result = createBuiltinMcps([])
+
+    // then
+    expect(result.lsp).toBeDefined()
+  })
+
   test("should return empty array when all MCPs are disabled", () => {
     // given - disable all known MCPs
     mock.module("../lsp", () => ({