Inherits a [workspace.lints] table into all four crates:
- clippy::await_holding_lock (deny): a std::sync Mutex/RwLock guard held
across .await blocks its Tokio worker and is one step from deadlock.
Async-aware locking belongs to tokio::sync.
- clippy::await_holding_refcell_ref (deny): same failure mode for
RefCell guards resumed on an arbitrary worker thread.
- clippy::undocumented_unsafe_blocks (warn): every future unsafe block
must carry a SAFETY justification; the workspace currently has zero
unsafe blocks, so this only gates what comes next (free-threading
work, buffer protocol).
- rustc::unsafe_op_in_unsafe_fn (warn): unsafe operations inside unsafe
fns need their own explicit unsafe block.
