Pin compose and local trial to ghcr.io/mixeme/selfpost:1.0.0, close the
CHANGELOG cut, and retire implementation-plan / v1.x-closure-plan.
Includes the post-cut startup fixes needed for a green release e2e gate:
root-owned TLS copies for postfix check, maillog_file_prefixes for /data,
hostname gate and traversable /data, panel /healthz before setup, and
setup-token / TempDir reclaim via docker exec.
Co-Authored-By: Composer <noreply@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
