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Codex
ffb232398a
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