feat(event): add published-prefix SPSC primitives and failure-atomic admission (ADR-0006..0009) #464

	# Conventional Commits — enforce PR title format for automated changelog generation.
	#
	# PR titles must follow the Conventional Commits specification:
	# type(scope): description
	#
	# Examples:
	# feat(gateway): add Ed25519 receipt signing
	# fix(sdk-python): handle empty parameters in canonicalization
	# docs: update API versioning guide
	# chore(deps): bump sqlx to 0.8.6
	#
	# This is required for release-please to categorize changelog entries correctly.

	name: PR Title (Conventional Commits)

	on:
	pull_request_target:
	types: [opened, edited, synchronize]

	permissions:
	pull-requests: read

	jobs:
	lint:
	name: Validate PR title
	runs-on: ubuntu-latest
	steps:
	- uses: amannn/action-semantic-pull-request@v6
	with:
	types: \|
	feat
	fix
	docs
	refactor
	test
	chore
	perf
	ci
	build
	security
	revert
	# Require a scope for certain types (optional — remove if too strict)
	requireScope: false
	# Allow ! for breaking changes (e.g. feat!: breaking change)
	subjectPattern: ^(?![A-Z]).+$
	subjectPatternError: \|
	The subject "{subject}" found in the pull request title "{title}"
	should start with a lowercase letter. This is required for
	consistent changelog formatting.
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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