P1-10 completed the JS-action checkout migration on 2026-08-27 09:39
(est/Est-Infra@57cc9f7) after tn gained a host node runtime (v22).
The 12:07 consolidation founded this repo on the P1-7 host-clone
fallback lineage instead, deleting the migrated copies at 12:25 —
live pipelines have run host git clone with stale 'tn does not
install node' headers ever since.
v3 restores the JS path in both templates, keeps the fallback's
HEAD==SHA assertion as an explicit postcondition step (guard is not
downgraded), and deletes reusable/checkout.yml which had zero
callers (reusable workflows cannot nest; its guard now lives inline).
Verified by a Seabed task-branch probe run before tagging v3
(coordination task M1-423, issue #32).
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