refactor: simplify session lifecycle and zellij runtime #36

	name: CLI E2E

	on:
	push:
	branches: [main]
	pull_request:
	paths:
	- "backend/**"
	- "test/cli/**"
	- ".github/workflows/cli-e2e.yml"

	permissions:
	contents: read

	jobs:
	# Primary tier: the cross-platform Go E2E suite (build tag `e2e`) runs the real
	# `ao` binary against isolated state on every OS GitHub hosts. These runners
	# are the "VMs" — the only place that exercises the OS-specific process-detach
	# paths (unix Setsid vs Windows CREATE_NEW_PROCESS_GROUP) and os.UserConfigDir
	# resolution. The suite builds its own binary and self-allocates a free port.
	native:
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	runs-on: ${{ matrix.os }}
	defaults:
	run:
	working-directory: backend
	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-go@v5
	with:
	go-version: "1.25"
	cache: false

	- name: CLI E2E (native)
	run: go test -tags e2e -v ./internal/cli/...

	# Secondary hardening tier: prove that a freshly installed binary works on a
	# clean machine with no Go toolchain and no developer state. The Dockerfile
	# installs `ao` on PATH in a slim image and runs test/cli/install-check.sh.
	# --init gives a real PID-1 reaper so the daemon the check starts is reaped
	# after `stop` instead of lingering as a zombie.
	container:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Build fresh-install image
	run: docker build -f test/cli/Dockerfile -t ao-cli-smoke .

	- name: Fresh-install check (container)
	run: docker run --rm --init ao-cli-smoke

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