fix(build): tighten TypeScript configuration and update dependencies for zod v4 compatibility

ts_tools/tool.http.ts

@@ -7,7 +7,7 @@ export function httpTool(): plugins.ToolSet {
       inputSchema: plugins.z.object({
         url: plugins.z.string().describe('URL to request'),
         headers: plugins.z
-          .record(plugins.z.string())
+          .record(plugins.z.string(), plugins.z.string())
           .optional()
           .describe('Request headers'),
       }),
@@ -39,11 +39,11 @@ export function httpTool(): plugins.ToolSet {
       inputSchema: plugins.z.object({
         url: plugins.z.string().describe('URL to request'),
         body: plugins.z
-          .record(plugins.z.unknown())
+          .record(plugins.z.string(), plugins.z.unknown())
           .optional()
           .describe('JSON body to send'),
         headers: plugins.z
-          .record(plugins.z.string())
+          .record(plugins.z.string(), plugins.z.string())
           .optional()
           .describe('Request headers'),
       }),