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The seed-drift guard shipped as refuse-boot: the backend exited when BACKEND_DICT_VERSION disagreed with the flat dir's recorded .seed_version. On the test contour that turned a harmless-in-intent action — bumping the TEST_DICT_VERSION variable to the active release (v1.2.1) on a volume seeded as v1.0.0 — into a crash loop, because DICT_VERSION is the *seed* of a fresh volume, not the active version (which the admin console drives). Make the marker authoritative instead: OpenWithVersions resolves the flat dir's version from .seed_version when present and ignores bootVersion on an already-seeded volume; bootVersion only seeds a fresh volume's marker. So a bumped build seed on a live volume is a no-op (it can't relabel live bytes and can't void games pinned to the prior label), and it correctly seeds the next fresh volume. The subdirectory scan now skips the resolved seed, so a version also present as a subdir (e.g. v1.2.1 uploaded via the console while the build seed is bumped to v1.2.1) is still loaded rather than shadowed by the flat bytes. Tests: marker-wins over a bumped boot version; a bumped boot keeps the matching subdir resident (the live-contour case). Docs updated (ARCHITECTURE §5, READMEs, compose/.env, PRERELEASE DV) from "refuses to boot" to "marker wins / ignored". Verified locally against v1.2.1: gofmt, build, vet, unit, integration green.