Add npm script to build a standalone binary using Bun's bytecode compilation.
The binary is ~30% faster than Node.js for CLI operations.
Benchmark results (10 runs, simple query):
- Bun Bytecode Binary: 1.82s avg
- Bun runtime: 2.09s avg
- Node.js: 2.59s avg
Startup time only (--help):
- Bun Bytecode: 0.049s (3.8x faster than Node)
- Bun runtime: 0.121s
- Node.js: 0.185s
Usage: npm run build:binary
Output: dist/pi-binary
Requires Bun 1.3+ for bytecode compilation support.
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