fix: make the percentile rank platform-independent #67

	# Synthetic-only CI: builds the project and runs the smoke test on every push
	# and pull request.
	#
	# This workflow never downloads Nasdaq market data and never runs benchmarks.
	# The bench_smoke target is compiled to prove the benchmark infrastructure
	# builds, but it is not executed and its output is never recorded.

	name: CI

	on:
	push:
	pull_request:

	jobs:
	build-and-test:
	name: ${{ matrix.preset }}
	runs-on: ubuntu-24.04
	strategy:
	fail-fast: false
	matrix:
	preset: [debug, asan-ubsan, release]
	steps:
	- uses: actions/checkout@v4

	- name: Install Ninja
	run: sudo apt-get update && sudo apt-get install -y ninja-build

	# Older ASan runtimes reject the high mmap randomization entropy on
	# recent Ubuntu kernels; pin it to a value ASan accepts.
	- name: Lower ASLR entropy for ASan
	if: matrix.preset == 'asan-ubsan'
	run: sudo sysctl -w vm.mmap_rnd_bits=28

	- name: Configure
	run: cmake --preset ${{ matrix.preset }}

	- name: Build
	run: cmake --build --preset ${{ matrix.preset }}

	- name: Test
	run: ctest --preset ${{ matrix.preset }}

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