fix(skill-mcp): pass workspace directory as cwd to stdio MCP processes

In OpenCode web multi-workspace mode, skill_mcp spawned stdio child
processes inherited process.cwd() instead of the session's workspace
directory. Pass toolContext.directory through SkillMcpClientInfo to
StdioClientTransport's cwd parameter.

src/features/skill-mcp-manager/stdio-client.ts

@@ -60,6 +60,7 @@ export async function createStdioClient(params: SkillMcpClientConnectionParams):
     args,
     env: mergedEnv,
     stderr: "ignore",
+    ...(info.directory ? { cwd: info.directory } : {}),
   })
 
   const client: McpClient = stdioClientDependencies.createClient(

src/features/skill-mcp-manager/types.ts

@@ -24,6 +24,7 @@ export interface SkillMcpClientInfo {
   skillName: string
   sessionID: string
   scope?: SkillScope | "local"
+  directory?: string
 }
 
 export interface SkillMcpServerContext {