doc: add per-tenant namespace isolation and teardown design #496

	name: PR title

	on:
	pull_request:
	# Re-check when the title (or base) changes, not just on new commits.
	types: [opened, edited, reopened, synchronize]
	branches: [main]

	permissions:
	contents: read

	concurrency:
	group: pr-title-${{ github.event.pull_request.number }}
	cancel-in-progress: true

	jobs:
	conventional:
	name: conventional commits
	runs-on: ubuntu-latest
	steps:
	- name: Validate PR title
	env:
	# Passed via env to avoid shell-injection from the title.
	PR_TITLE: ${{ github.event.pull_request.title }}
	run: \|
	python3 - <<'PY'
	import os, re, sys

	title = os.environ["PR_TITLE"]
	types = "feat\|fix\|enhance\|test\|doc\|bench\|build\|ci\|chore"
	# <type>(<scope>)?!?: <description> (scope optional, ! = breaking)
	pattern = rf"^(?:{types})(?:$[a-z0-9._-]+$)?!?: .+"

	if not re.match(pattern, title):
	print(f"::error::PR title does not follow Conventional Commits: {title!r}")
	print()
	print("Expected: <type>(<scope>): <description>")
	print(f" type : {types.replace('\|', ', ')}")
	print(" scope : optional, e.g. core, coordinator, worker, fuse")
	print(" Example: feat(worker): add page-level eviction")
	sys.exit(1)

	subject_max = 72
	if len(title) > subject_max:
	print(f"::error::PR title is {len(title)} chars; keep it <= {subject_max}.")
	sys.exit(1)

	print(f"OK: {title}")
	PY

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