Add Lua, Python, Ruby, and Wren implementations of the binary_trees benchmark from the Computer Language Benchmarks Game. Update the benchmark runner to support multiple benchmarks with output validation, and fix the Wren compiler to handle the '\t' escape sequence in string literals.
Add a new JavaScript benchmark file `benchmark/fib.js` that implements a recursive Fibonacci function and measures execution time using `process.hrtime()`. Register the JavaScript language entry in `benchmark/run_all` with the `node` interpreter and `.js` extension, enabling JS benchmarks to be included in the full benchmark suite alongside existing languages.
Extract hardcoded trial count into NUM_TRIALS constant set to 7, collect all timing results into a list, and add graph_results function that prints a horizontal ASCII bar chart scaling each run's times relative to the global maximum across all benchmarks and languages.
Add a benchmark runner script (benchmark/run_all) that executes multiple
fibonacci implementations across languages (Lua, Python, Ruby, Wren) and
computes mean, median, and standard deviation from 7 runs. Update existing
fib benchmarks to loop 5 times at fib(30) with elapsed timing. Introduce
OS.clock primitive in C core and OS class to support timing in Wren.
Adjust number formatting to "%.14g" for consistent output precision.
