Add slope, aspect, geodesic measurement, and classification tools #13

	name: CI

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

	jobs:
	build-and-test:
	runs-on: ubuntu-latest
	timeout-minutes: 10

	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-go@v5
	with:
	go-version-file: go.mod
	cache: true

	- name: Build
	run: go build ./...

	- name: Vet
	run: go vet ./...

	- name: Test
	run: go test ./... -v -race -coverprofile=coverage.out -covermode=atomic

	- name: Enforce coverage floor
	run: \|
	coverage=$(awk 'BEGIN{covered=0;total=0} /^mode:/{next} {total+=$2; if ($3 > 0) covered+=$2} END{if (total==0) {print "0.0"} else {printf "%.1f", (covered/total)*100}}' coverage.out)
	echo "Total coverage: ${coverage}%"
	awk -v cov="$coverage" 'BEGIN { if (cov + 0 < 50.0) { printf "coverage %.1f%% is below required 50.0%%\n", cov + 0; exit 1 } }'

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