STEP=STEP_050M07R13E3_INTEGRATE_LATEST_OLD_INTO_SINGLE_PUBLISH
RESULT=PASS_STEP_050M07R13E3_INTEGRATE_LATEST_OLD_INTO_SINGLE_PUBLISH

Purpose:
Restore and preserve the original one-command workflow while adapting publication to the latest/old layout.

Correction of the failed R13E approach:
- router-machine-close was not wrapped and was not renamed.
- no .core chain or /usr/local helper layer is used.
- the central router-publish-report now performs the complete transaction itself.
- a new artifact is built outside the public tree, then atomically moved into latest/.
- the previous artifact of the same kind moves into old/.
- unrelated current artifacts remain in latest/.
- on publication failure, the layout transaction rolls back.
- machine backends consume PUBLISHED_RELATIVE_PATH and publish direct URLs inside latest/.

Changed VM130 files:
- /opt/router-ops/bin/router-publish-report
- /opt/router-ops/bin/router-public-reindex
- /opt/router-ops/bin/router-vm100-git-source-publish
- /opt/router-ops/bin/router-vm101-git-source-publish
- /opt/router-ops/bin/router-vm121-git-source-publish

Unchanged:
- /opt/router-ops/bin/router-machine-close
- VM100, VM101 and VM121 runtime/source state
- Git repositories and machine commits

Verification:
- complete-file hashes matched the prepared candidates;
- shell syntax passed for all five files;
- two consecutive simulated VM101 publications left exactly one VM101 folder in latest/;
- prior VM101 publications moved into old/;
- unrelated global plan remained in latest/;
- failed simulated publication did not alter latest/;
- root/latest/old indexes were regenerated;
- router-machine-close retained SHA256 bfa28b24bf6148c89f367eaad200d2992c97972ec479f05706f50471b96b38c4.

RUNTIME_IMPACT=false
VM100_CHANGED=false
VM101_CHANGED=false
VM121_CHANGED=false
VM130_WORKFLOW_CHANGED=true
ROLLBACK=/opt/router-ops/state/public-layout-single-publish/20260714-084454/report-build/rollback.sh
VM130_SOURCE_URL=https://receiver-rejected-average-combat.trycloudflare.com/r/e94a0859747d7b96f29c7fdafc2d0351ba603bb0a7e9e5a4/latest/20260714-084455_vm130_router_ops_source_snapshot_r13e3/