Release v2.1.0

[mxsm]

Summary

Prepare cheetah-string v2.1.0 after the architecture-roadmap improvements merged in #131.

Changes

• bump crate version from 2.0.0 to 2.1.0
• update README installation snippets and crate-level feature example
• update benchmark metadata example version
• update release workflow dispatch hint
• update fuzz/Cargo.lock path dependency version

Validation

Local validation passed:

• cargo fmt --all
• cargo check --all-features --all-targets
• cargo test --all-features
• cargo clippy --all-features --all-targets -- -D warnings
• cargo test --no-default-features --features serde,bytes,simd
• cargo package in a clean temporary worktree

Release

After this PR is merged, trigger .github/workflows/release.yml with version 2.1.0.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c5830554-691b-42fd-bc22-d06aae64d060

📥 Commits

Reviewing files that changed from the base of the PR and between 6862eae and 282db2e.

⛔ Files ignored due to path filters (1)

• fuzz/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• .github/workflows/release.yml
• Cargo.toml
• README.md
• bench-results/README.md
• src/lib.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mxsm/release-v2.1.0

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