This reverts commit 7249b33fca.
Removes the four devlog entry records added by that commit
(step-5-completion, step-6-surface-discovery,
contract-5-3-accepted-baseline, step-6-completion) and restores
.labyricorn/devlog/contents.lr to its prior title and summary.
The annotated tags contract-5.3-accepted-baseline and step-6-complete,
and all underlying implementation, documentation and evidence, are
unchanged. Only .labyricorn/devlog/ publishing records are affected;
the uncommitted project identity record and other working-tree changes
are deliberately left out of this commit.
python devlog_editor.py --validate passes; git diff --check clean.