Challenge 4: Kani contracts for BTreeMap node - #641
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Kani contracts and harnesses for verify-rust-std challenge. Fixes rust-lang#77
Drop the duplicate super imports that failed rustc fmt. Build symbolic leaves without nested Handle::new_kv so the contract proof has a single top-level call. Replace n+count in any_where predicates with saturating_sub so Kani does not fail on usize overflow.
Drop the weak loop_invariant that havocs SplitResult node pointers into unconstrained values. Copy leaf occupancy with ptr::copy so insert_recursing proofs can use unwind 3 instead of 13.
Partition 1 and autoharness ubuntu ended with runner shutdown, not a Kani counterexample.
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Summary
Kani safety contracts and proof harnesses for this challenge. Runtime stdlib logic is unchanged; annotations are cfg(kani) / contract attributes.
Memory-safety contracts on btree::node.
Validation
challenge/04-btree-nodescripts/run-kani.sh)Fixes #77
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