docs: add rust-performance-optimization skill

[cm-ayf]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.46%. Comparing base (a77a27a) to head (5158bc6).

Additional details and impacted files

@@ Coverage Diff @@## main #133 +/- ##
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Coverage 71.46% 71.46% =======================================
Files 37 37 Lines 1675 1675 =======================================
Hits 1197 1197 Misses 478 478 

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[Copilot]

Pull request overview

Adds a new repository Skill documenting a repeatable workflow for safe Rust performance optimization (benchmarking, assembly inspection, profiling), and adjusts example metadata in Cargo.toml so the examples are no longer gated behind the binary feature.

Changes:

• Add .github/skills/rust-performance-optimization/SKILL.md describing a step-by-step optimization workflow and checklist.
• Add .github/skills/rust-performance-optimization/references/tools.md with command references for cargo bench, cargo asm, and profiling tools.
• Update Cargo.toml example entries by commenting out required-features = ["binary"] for is-bonsai and genji.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
Cargo.toml	Updates example metadata (removes binary feature gating via comments).
.github/skills/rust-performance-optimization/SKILL.md	New skill document describing the performance optimization workflow for this repo.
.github/skills/rust-performance-optimization/references/tools.md	New tooling reference for bench/asm/flamegraph workflows.

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