fix: restore three-branch parity and Jackson 3 compatibility #55

	# CI workflow for the feature/3.0.x line (JDK 21)
	#
	# Triggers:
	# - push / pull_request on the feature/3.0.x branch
	# - manual workflow_dispatch
	#
	# Runs `./mvnw -B clean verify` (Maven 4 via the checked-in wrapper — the
	# runner's bundled Maven 3 cannot parse the POM 4.1.0 model) which includes
	# the JaCoCo coverage gate (90% line coverage, haltOnFailure=false).
	name: CI

	on:
	push:
	branches: [feature/2.0.x]
	pull_request:
	branches: [feature/2.0.x]
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	build:
	name: JDK 17 Build & Verify
	runs-on: ubuntu-latest
	timeout-minutes: 30
	steps:
	- name: Checkout source
	uses: actions/checkout@v7

	- name: Verify three-branch source parity
	run: bash scripts/check-branch-parity.sh

	- name: Set up JDK 21
	uses: actions/setup-java@v5
	with:
	distribution: temurin
	java-version: '17'
	cache: maven

	- name: Build and verify with JaCoCo coverage gate
	run: mvn -B --no-transfer-progress clean verify

	- name: Upload JaCoCo coverage report
	if: always()
	uses: actions/upload-artifact@v7
	with:
	name: jacoco-coverage
	path: target/site/jacoco
	retention-days: 14

	- name: Upload surefire reports
	if: always()
	uses: actions/upload-artifact@v7
	with:
	name: surefire-reports
	path: target/surefire-reports
	retention-days: 14

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