The WASM_BUILD_STD=0 approach caused panic_impl duplicate errors because
wasm32-unknown-unknown pre-built sysroot includes std, conflicting with
pezsp-io's panic handler in wasm runtime builds.
Local testing confirmed that wasm32v1-none + no build-std + serde fork
works correctly. The wasm-builder creates a separate cargo project that:
- Excludes std/default features from the runtime
- Has no client crates in the dependency tree
- Properly uses the serde fork for target_os="none" handling
Restore rustup target add wasm32v1-none in all 14 CI build jobs and
remove all WASM_BUILD_STD=0 overrides.
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