Spec review r1 returned two blocking findings and both were right.
A measured side that is itself a passage would have been shortened by its
neighbouring walls, while insetContour — the very function the area label
already uses — treats that joint as a flat cap and shortens nothing. Length
and area would have diverged again, at a different boundary, which is the
defect this task exists to remove. The zero rule now comes first and returns
the full centreline length for an open side.
The thickness source was wrong as a matter of fact, not of taste: an
existing test shows thicknessCmAt returns 0 for a whole-edge query against a
partially set thickness, so a split-thickness edge would have silently
stopped shortening. Half-depths now come from roomWallProfile, the atomic
profile that innerContourForRoom already uses for the area, so one edge is
resolved by one mechanism.
Two acceptance criteria and two mutation guards added for the closed
findings.
Issue: #233
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Matysh