DO NOT MERGE TO DEV: chore(ci): retire the WIP-limit nudge (no-op tombstone, not a deletion)

[LukasWodka]

Summary

Retires the WIP-limit nudge org-wide. The kanban's Code review limit of 30 assumed a human-paced queue; the column now sits around 50 with items turning over in days, so the nudge fired on nearly every PR and carried no signal. A limit that is always exceeded is noise, not a limit.

All 15 caller PRs are merged — backend#1438 · tracebloc-engine#566 · client-runtime#254 · averaging-service#276 · frontend-app#731 · data-ingestors#434 · tracebloc-py-package#371 · cli#446 · design-system#103 · client#535 · docs#74 · model-zoo#114 · start-training#31 · tracebloc-website#421 · claude-skills#17

This PR no longer deletes the reusable — and that is deliberate

The first version of this PR deleted wip-limit-check.yml. That would have broken the release train's own promotion PRs in every repo.

A workflow file lives on every branch it was ever merged into, and the caller was only removed from develop. Measured 2026-08-02, after all 15 merges:

branch	repos still carrying the caller
staging	10 — all release-train repos
main / master	14

A pull_request invokes the workflow on its base branch. Promotion PRs are based on staging and main/master — precisely the branches that still have the caller. And a caller pointing at a deleted reusable does not degrade quietly: it fails hard, turning a soft comment into a red check.

Those copies only clear after the deletion propagates through a staging hop and a prod hop — two full release cycles.

So this PR now makes the reusable a no-op tombstone: same workflow_call signature, body replaced with a single notice. Every lingering caller stays green, the nudge stops everywhere the moment this reaches main, and there is no ordering hazard left to get wrong.

Delete the file for real once grep -r wip-limit-check across all branches of all repos comes back empty. The tombstone says so in its own header.

Also in this PR

• Deletes .github's own caller (wip-limit-caller.yml) — this repo's copy, safe to remove outright.

Note

There was never an In progress WIP limit. The reusable only ever accepted status-name defaulting to "Code review" with limit: 30, and no caller overrode it. Nothing else to remove.

Nothing gated on this — it never blocked a merge and no required status check is affected.

Refs: tracebloc/backend#1405

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