Drop the hand-maintained ISO_VERSION=0.1.0. Default ISO_VERSION=auto resolves at
build time from the zot checkout (git describe --tags), falling back to the pinned
ZOT_VERSION, and strips the leading v (v0.2.29 -> 0.2.29). Records zot_version +
zot_commit in build-manifest.json; the banner shows which zot it tracks. Set
ISO_VERSION=x.y.z to override.
Also drops the stale 'independent from Clawdie-AI runtime version' comment — the
version's only anchor is zot now.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
