CODE-REVIEW-316-r1 H1: the §3.3 degraded pool picked an angle-compatible wall
at ANY distance, but the backend geometry-match invariant («wall opening
geometry must match its host») requires the host to agree with the opening's
own x/y — the migrated document was rejected by CONFIG_SCHEMA and the write
wedged again on the schema layer. The pool is removed from both migrations
(TS and the Python mirror): without an in-place eligible carrier the opening
goes straight to the unhosted degraded state, exactly the alternative the
spec's «assumed freely changeable» section reserved; the spec is revision 6.
New tests replay the reviewer's reproduction on both sides, and the frontend
test is proven able to fail by restoring the pool (executed red).
CODE-REVIEW-316-r2 M2: the schema-level host check is shared with #132
partition openings, so its unhosted relaxation is now pinned by a regression
test — a stale writer that keeps a partition-hosted opening but silently
drops its host is still rejected by validate_partition_opening_hosts.
Issue: #316
User-Visible: no
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