fix(mcp): resolve local mcp runtimes

Resolve built-in local MCP runtime executables before handing command arrays to OpenCode so lsp and ast_grep do not depend on a bare node or bun lookup in the host PATH.

Keep source, dist, bootstrap, workspace-safety, and disabled_mcps behavior covered by focused tests and real OpenCode MCP status QA.

Plan: plans/fix-built-in-mcp-runtime-executables.md

src/mcp/index.ts

@@ -3,6 +3,7 @@ import { context7 } from "./context7"
 import { grep_app } from "./grep-app"
 import { createAstGrepMcpConfig } from "./ast-grep"
 import { createLspMcpConfig, type LocalMcpConfig } from "./lsp"
+import type { RuntimeExecutableResolver } from "./runtime-executable"
 import type { OhMyOpenCodeConfig } from "../config/schema"
 
 export { McpNameSchema, type McpName } from "./types"
@@ -19,6 +20,7 @@ type BuiltinMcpConfig = RemoteMcpConfig | LocalMcpConfig
 
 type BuiltinMcpOptions = {
   readonly cwd?: string
+  readonly resolveExecutable?: RuntimeExecutableResolver
 }
 
 export function createBuiltinMcps(disabledMcps: string[] = [], config?: OhMyOpenCodeConfig, options: BuiltinMcpOptions = {}) {
@@ -40,11 +42,15 @@ export function createBuiltinMcps(disabledMcps: string[] = [], config?: OhMyOpen
   }
 
   if (!disabledMcps.includes("lsp")) {
-    mcps.lsp = createLspMcpConfig()
+    mcps.lsp = createLspMcpConfig({ resolveExecutable: options.resolveExecutable })
   }
 
   if (!disabledMcps.includes("ast_grep")) {
-    mcps.ast_grep = createAstGrepMcpConfig({ cwd: options.cwd, disabledTools: config?.disabled_tools })
+    mcps.ast_grep = createAstGrepMcpConfig({
+      cwd: options.cwd,
+      disabledTools: config?.disabled_tools,
+      resolveExecutable: options.resolveExecutable,
+    })
   }
 
   return mcps