add benchmarks page with interactive charts

[cs01]

Summary

• The /benchmarks page was blank because it referenced a <BenchmarkBars /> component that didn't exist
• Created BenchmarkBars.vue — shows all benchmarks where ChadScript places top 3, grouped by 1st place / top 3
• Fleshed out benchmarks.md with methodology section and reproduction instructions
• Uses the filtered benchmarks.json (top-3 only) so we don't show benchmarks where ChadScript looks bad

Test plan

• Verify /benchmarks page renders with bar charts
• Check mobile layout
• Verify data loads from benchmarks.json

[github-actions]

Benchmark Results (Linux x86-64)

Benchmark	C	ChadScript	Go	Node	Bun	Place
Binary Trees	1.357s	1.182s	2.674s	1.150s	0.993s	🥉
Cold Start	0.9ms	0.8ms	1.2ms	25.7ms	8.7ms	🥇
Fibonacci	0.821s	1.472s	1.557s	3.183s	1.938s	🥈
File I/O	0.122s	0.091s	0.085s	0.199s	0.171s	🥈
JSON Parse/Stringify	0.004s	0.005s	0.017s	0.015s	0.007s	🥈
Matrix Multiply	0.444s	0.714s	0.608s	0.371s	0.342s	#5
Monte Carlo Pi	0.389s	0.410s	0.405s	2.249s	6.024s	🥉
N-Body Simulation	1.671s	2.120s	2.203s	2.386s	3.254s	🥈
Quicksort	0.214s	0.245s	0.213s	0.262s	0.226s	#4
SQLite	0.361s	0.398s	—	0.416s	0.405s	🥈
Sieve of Eratosthenes	0.015s	0.028s	0.020s	0.039s	0.036s	🥉
String Manipulation	0.008s	0.044s	0.017s	0.037s	0.027s	#5

CLI Tool Benchmarks

Benchmark	ChadScript	grep	node	xxd	Place
Hex Dump	0.426s	—	0.917s	0.128s	🥈
Recursive Grep	0.018s	0.009s	0.095s	—	🥈