Upgrade rust toolchain to 1.86.0 for dual-verse-dag

[simonjiao]

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• Bugfix
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• Build related changes
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[Copilot]

Pull Request Overview

This PR upgrades the Rust toolchain from version 1.82.0 to 1.86.0 for the dual-verse-dag project. The upgrade introduces compatibility changes across the codebase to work with the newer Rust version.

• Toolchain version update from 1.82.0 to 1.86.0
• Lifetime parameter simplifications using the '_ anonymous lifetime
• Iterator method updates to use more modern alternatives

Reviewed Changes

Copilot reviewed 53 out of 56 changed files in this pull request and generated no comments.

File	Description
rust-toolchain.toml	Updates Rust channel from 1.82.0 to 1.86.0
Cargo.toml	Updates rust-version and dependency versions, reorganizes patch sections
.github/workflows/build_test.yml	Removes clippy lint flag and updates RUSTFLAGS
Multiple .rs files	Simplifies lifetime parameters and modernizes iterator usage

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