CMake config: also find_dependency(nlohmann_json), and freshen vcpkg.… #16

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:
	name: ${{ matrix.os }}
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ ubuntu-latest, macos-latest, windows-latest ]

	steps:
	- uses: actions/checkout@v4

	# --- dependencies ---
	- name: Install dependencies (Linux)
	if: runner.os == 'Linux'
	run: sudo apt-get update && sudo apt-get install -y libcurl4-openssl-dev nlohmann-json3-dev

	- name: Install dependencies (macOS)
	if: runner.os == 'macOS'
	run: brew install nlohmann-json # libcurl ships with macOS

	# --- configure ---
	- name: Configure (Linux/macOS, system packages)
	if: runner.os != 'Windows'
	run: cmake -B build -S . -DCMAKE_BUILD_TYPE=Release

	- name: Configure (Windows, vcpkg)
	if: runner.os == 'Windows'
	run: \|
	# Sync the runner's vcpkg to the manifest's builtin-baseline so its
	# port/version database matches, then configure.
	$base = (Get-Content vcpkg.json \| ConvertFrom-Json).'builtin-baseline'
	git -C "$env:VCPKG_INSTALLATION_ROOT" fetch --depth 1 origin $base
	git -C "$env:VCPKG_INSTALLATION_ROOT" checkout -f $base
	& "$env:VCPKG_INSTALLATION_ROOT\bootstrap-vcpkg.bat" -disableMetrics
	cmake -B build -S . "-DCMAKE_TOOLCHAIN_FILE=$env:VCPKG_INSTALLATION_ROOT/scripts/buildsystems/vcpkg.cmake"

	# --- build + verify install/export ---
	- name: Build
	run: cmake --build build --config Release

	- name: Install (verify export)
	run: cmake --install build --config Release --prefix "${{ runner.temp }}/nml-install"

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