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
Implements spec revision 4 (green r4). §3.1 — a legacy open_spans/open_to cut
never zeroes the atom that carries an existing contour opening: the opening's
edges become atom boundaries, the door keeps its real wall and the zero run
continues on both sides. §3.2 — an ambiguous carrier resolves
deterministically: current host, then distance, thicker cm, smaller id.
§3.3 — an opening with no usable carrier persists unhosted: a valid degraded
v9 state, inert in the physics, rendered by its own x/y, kept by later writes
and re-placeable in the editor (backend schema accepts it). §3.4 — the
initial migration never throws over an opening; a post-v9 write that LOST its
carrier keeps the fail-closed opening-host refusal. The Python migration
mirror implements the same rules with byte-identical output (verified on the
span+door fixture including the segment id).
The new smoke replays #316 end to end: a conflicted space no longer blocks
drawing on an empty plan. The golden scene span-over-door-migrated-dark
renders the migrated fixture pinned byte-for-byte to the real writer; two
gate mutants revert §3.1 and §3.4 and are red by execution.
Issue: #316
User-Visible: yes
A stale client can only echo the stored model_version, never raise it. The
'unchanged wall catalogue' refusal now applies only when the submitted model
is not above the stored one; the first v9 write over a v8 document with an
orphan open_span/open_to legitimately drops the legacy projection without
touching the catalogue and passes. The regression pair fixture is produced
by the real writers (stored: v1.68.0-beta.2, sent: current migration) and is
pinned on the frontend byte-for-byte so it cannot drift.
Issue: #319
User-Visible: yes
