fix: harden web fetch SSRF and redirects

Co-authored-by: Eli <fogboots@users.noreply.github.com>

src/config/zod-schema.agent-runtime.ts

@@ -147,6 +147,7 @@ export const ToolsWebFetchSchema = z
     maxChars: z.number().int().positive().optional(),
     timeoutSeconds: z.number().int().positive().optional(),
     cacheTtlMinutes: z.number().nonnegative().optional(),
+    maxRedirects: z.number().int().nonnegative().optional(),
     userAgent: z.string().optional(),
   })
   .strict()