clean up banner in README [MINOR]

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📊 Benchmark Comparison Report

This pull request includes Criterion benchmarks comparing performance to the main branch.
This comment will automatically update as the benchmarks are re-run on each commit.

The table below shows relative ratios and timing stats for each benchmark group:

group                main                                   pr
-----                ----                                   --
ops/merge            1.00   1381.3±9.05ns        ? ?/sec    1.09  1506.8±45.99ns        ? ?/sec
ops/project          1.00    540.6±8.36ns        ? ?/sec    1.10    592.9±8.69ns        ? ?/sec
serde/deserialize    1.00    273.6±4.38ns        ? ?/sec    1.15    313.6±3.68ns        ? ?/sec
serde/serialize      1.00   254.2±14.62ns        ? ?/sec    1.16   294.1±12.24ns        ? ?/sec

✅ Benchmarks completed successfully.

🧠 Notes:

• These benchmarks are not a pass/fail gate and are informative only.
• Use this as a signal to review performance-sensitive changes.
• Results may be unreliable due to GHA runner hardware variance.
• If results indicate a significant performance regression, run the benchmarks locally to confirm.

Reported by the benchmark CI bot