toolkit: http_fetch through curl

Implemented-By: OpenCode session (model recorded in docs/implementer-log.md)

crates/toolkit/src/lib.rs

@@ -1,7 +1,8 @@
 //! The programs that run inside tool containers.
 
-use proto::tools::{ReadFileArgs, ShellArgs, WriteFileArgs};
+use proto::tools::{HttpFetchArgs, ReadFileArgs, ShellArgs, WriteFileArgs};
 
+pub mod fetch;
 pub mod files;
 pub mod input;
 pub mod shell;
@@ -85,6 +86,13 @@ pub fn run(name: &str, stdin: &mut dyn std::io::Read) -> Outcome {
             };
             shell::shell(&args)
         }
+        "http_fetch" => {
+            let args = match input::parse::<HttpFetchArgs>(name, &text) {
+                Ok(a) => a,
+                Err(e) => return Outcome::misuse(e),
+            };
+            fetch::fetch(&args)
+        }
         _ => Outcome::misuse(format!("toolkit: unknown tool {name:?}")),
     }
 }