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build

Merge remote-tracking branch 'origin/main' into maze-interactive-api #6

	name: build

	on:
	push:
	pull_request:

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up JDK
	uses: actions/setup-java@v4
	with:
	distribution: temurin
	java-version: '21'
	cache: maven

	- name: Build and test
	run: mvn -B verify

	- name: Verify Java 8 bytecode (class file major version 52)
	run: \|
	set -euo pipefail
	mkdir -p /tmp/classcheck
	unzip -o -q target/maze-solver.jar -d /tmp/classcheck
	fail=0
	while IFS= read -r -d '' f; do
	major=$(od -An -t u1 -j 7 -N 1 "$f" \| tr -d ' ')
	if [ "$major" != "52" ]; then
	echo "::error file=$f::class file major version $major, expected 52 (Java 8)"
	fail=1
	fi
	done < <(find /tmp/classcheck -name '*.class' -print0)
	exit $fail

	- name: Check jar size budget
	env:
	MAX_BYTES: 1048576
	run: \|
	set -euo pipefail
	size=$(stat -c%s target/maze-solver.jar)
	echo "jar size: $size bytes (budget: $MAX_BYTES)"
	if [ "$size" -gt "$MAX_BYTES" ]; then
	echo "::error::jar exceeds size budget ($size > $MAX_BYTES bytes) — this downloads into the browser on first run, keep it lean"
	exit 1
	fi

	- name: Upload jar
	uses: actions/upload-artifact@v4
	with:
	name: maze-solver-jar
	path: target/maze-solver.jar