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-evm.yml

@@ -26,6 +26,10 @@ jobs:
     timeout-minutes: 60
     container:
       image: ${{ needs.preflight.outputs.IMAGE }}
+    env:
+      # 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
     permissions:
       pull-requests: write
     strategy:
@@ -111,6 +115,9 @@ jobs:
       # but still want to have debug assertions.
       RUSTFLAGS: "-C debug-assertions"
       RUST_BACKTRACE: 1
+      # 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
     strategy:
       matrix:
         platform: