feat(challenges): add term-challenge WASM module (#19)

* feat(challenges): add term-challenge WASM module

Add a new WASM challenge crate for the terminal benchmark challenge (v2),
along with the cloned term-challenge v2 reference repository and SDK
improvements to support the new pattern.

Core changes:
- New crate challenges/term-challenge-wasm/ targeting wasm32-unknown-unknown
  (cdylib) that implements the Challenge trait with evaluate() and validate()
  methods. The evaluate() method deserializes agent task results via bincode,
  computes a pass-rate score (0-100), and returns structured output. The
  validate() method checks for non-empty agent data and challenge ID.
- Updated register_challenge!() macro in challenge-sdk-wasm to use a const
  fn new() constructor instead of Default::default(), enabling static
  initialization required by no_std WASM modules.
- Added challenges/term-challenge/ as a reference clone of the
  PlatformNetwork/term-challenge v2 branch.
- Added term-challenge-wasm to workspace members in root Cargo.toml.
- Updated Cargo.lock with the new crate and its dependencies.

* chore: remove submodule entry for term-challenge before merge

* fix: resolve merge conflicts and fix register_challenge macro call

* chore: trigger CI

Author: echobt

Cargo.toml

@@ -14,6 +14,7 @@ members = [
     "crates/p2p-consensus",
     "crates/wasm-runtime-interface",
     "crates/challenge-sdk-wasm",
+    "challenges/term-challenge-wasm",
     "bins/validator-node",
     "bins/utils",
     "bins/mock-subtensor",

crates/challenge-sdk-wasm/src/lib.rs

@@ -38,11 +38,18 @@ pub fn pack_ptr_len(ptr: i32, len: i32) -> i64 {
 /// functions (`evaluate`, `validate`, `get_name`, `get_version`,
 /// `generate_task`, `setup_environment`, and `alloc`).
 ///
+/// The type must provide a `const fn new() -> Self` constructor so that the
+/// challenge instance can be placed in a `static`.
+///
 /// # Usage
 ///
 /// ```ignore
 /// struct MyChallenge;
 ///
+/// impl MyChallenge {
+///     pub const fn new() -> Self { Self }
+/// }
+///
 /// impl platform_challenge_sdk_wasm::Challenge for MyChallenge {
 ///     fn name(&self) -> &'static str { "my-challenge" }
 ///     fn version(&self) -> &'static str { "0.1.0" }