docs: Add testing requirements to contributing and agent guides #752

	# Check for code formatting and license header errors using Spotless
	#
	# Description:
	# Runs Spotless check for pull requests to ensure code formatting consistency,
	# proper import ordering, and license headers.
	# Fails the build if any violations are found.
	#
	# Deliberately has no `paths` filter: `mvn spotless:check` runs across every
	# Maven module, so filtering by path would skip the job for changes it still
	# validates. A module missing from such a filter (e.g. otel-plugin) can merge
	# unformatted code and then break this check on unrelated pull requests.
	#
	# Triggers:
	# - pull_request: every PR targeting main
	# - push: main, to catch any formatting drift that lands
	# - workflow_dispatch: manual run
	name: Spotless

	on:
	workflow_dispatch:
	pull_request:
	branches:
	- main
	push:
	branches:
	- main

	permissions:
	contents: read

	jobs:
	spotless-check:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v7

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

	- name: Run Spotless check
	run: mvn -B -q spotless:check --file pom.xml

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