fix: add SKIP_WASM_BUILD to all workflows affected by serde_core issue

Workflows updated:
- tests-evm.yml: differential-tests and evm-test-suite jobs
- tests-linux-stable-coverage.yml: test-linux-stable-coverage job
- tests-linux-stable-xp.yml: both test jobs (currently disabled but ready)
- tests-misc.yml: test-full-crypto-feature job

All changes include tracking comment for issue #358.
The serde_core + Rust 1.88 + wasm32 combination causes duplicate lang item
error. These jobs don't require WASM output, so skip it.

.github/workflows/tests-linux-stable-coverage.yml

@@ -34,6 +34,9 @@ jobs:
       # -Cinstrument-coverage slows everything down but it is necessary for code coverage
       # https://doc.rust-lang.org/rustc/instrument-coverage.html
       RUSTFLAGS: "-Cdebug-assertions=y -Dwarnings -Cinstrument-coverage"
+      # Temporary: Skip WASM build due to serde_core + Rust 1.88 + WASM bug
+      # Tracking: https://github.com/pezkuwichain/pezkuwi-sdk/issues/358
+      SKIP_WASM_BUILD: 1
       LLVM_PROFILE_FILE: "/__w/pezkuwi-sdk/pezkuwi-sdk/target/coverage/cargo-test-${{ matrix.ci_node_index }}-%p-%m.profraw"
     strategy:
       fail-fast: false