templates v3: checkout back on actions-checkout@v4 + drop orphan reusable/checkout.yml #1

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zcode-mulm merged 1 commits from task/v3-checkout-actions-checkout into main 2026-08-29 13:38:21 +00:00
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Restores the P1-10 JS-action checkout migration (est/Est-Infra@57cc9f7, 08-27 09:39) that the 08-27 12:07 consolidation dropped; keeps HEAD==SHA as explicit postcondition; deletes zero-caller orphan reusable/checkout.yml; fixes stale tn-does-not-install-node headers.

Coordination: task/M1-423-ci-v3-checkout (card d50c41f), issue est/Est-Platform-Coordination#32. Seabed private-repo probe run gates the v3 tag.

Restores the P1-10 JS-action checkout migration (est/Est-Infra@57cc9f7, 08-27 09:39) that the 08-27 12:07 consolidation dropped; keeps HEAD==SHA as explicit postcondition; deletes zero-caller orphan reusable/checkout.yml; fixes stale tn-does-not-install-node headers. Coordination: task/M1-423-ci-v3-checkout (card d50c41f), issue est/Est-Platform-Coordination#32. Seabed private-repo probe run gates the v3 tag.
zcode-mulm added 1 commit 2026-08-29 13:31:56 +00:00
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).
zcode-mulm merged commit 12b01c6cc5 into main 2026-08-29 13:38:21 +00:00
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Reference: mu-ref/ci-workflows#1