Summary

• remove the internal masterror-derive proc macro crate from the workspace
• re-export thiserror::Error from masterror and adjust integration tests to the upstream semantics
• refresh trybuild UI expectation files for the new diagnostics

Testing

• cargo +nightly-2025-08-01 fmt
• cargo +1.89.0 clippy --workspace --all-targets --all-features -- -D warnings
• cargo +1.89.0 build --workspace --all-targets
• cargo +1.89.0 test --workspace --all-features --no-fail-fast
• cargo +1.89.0 doc --no-deps
• cargo +1.89.0 package --locked --allow-dirty

https://chatgpt.com/codex/tasks/task_e_68ca42250420832b881580f675fc7303