🧹 refactor: replace unwrap with safe check in cache eviction

[undivisible]

🎯 What: Removed the unsafe unwrap() call in src/cache.rs and replaced it with a safe if let check.
💡 Why: This improves maintainability and reliability by avoiding a potential panic during cache eviction if the element is not found, making the codebase more resilient.
✅ Verification: Verified by running cargo fmt, cargo clippy, and cargo test --locked. No functionality was changed or broken, and all tests passed.
✨ Result: The move_to_back function now correctly handles unexpected empty results from order.remove() gracefully, ensuring the cache does not panic in edge cases.

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PR created automatically by Jules for task 4667453177487613054 started by @undivisible

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Note

Low Risk
Single-line control-flow change in an internal helper with no API or behavior change beyond avoiding a theoretical panic.

Overview
move_to_back in src/cache.rs no longer panics if VecDeque::remove returns None after a matching index was found. The post-position path now uses if let Some(k) = order.remove(index) before push_back, instead of unwrap().

LRU touch behavior on cache get and insert is unchanged; this is a defensive reliability tweak in the eviction ordering helper.

^{Reviewed by Cursor Bugbot for commit 68fed0c. Configure here.}

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