cleanup: purge defunct/orphan CI files (2026-07-08 broader)

[opoudjis]

Supersedes #50 from prior cimas-sync waves.

Summary

Broader-orphan cleanup: purge defunct / orphan CI files across the fleet. Follow-up to the 2026-07-05 generate.yml cleanup wave that landed as part of the metanorma/ci#347 remediation. This picks up the historical drift the ci#347 scope filter deliberately excluded.

Files removed (all no longer in cimas.yml mapping)

• .hound.yml — Hound code review service defunct since ~2020.
• .github/workflows/rake.yml — orphan rake workflows (superseded by cimas-generated variants under master/rake.yml.erb).
• .github/workflows/notify.yml — orphan notify workflows.
• .github/workflows/integration.yml — orphan integration workflows.
• .github/workflows/test.yml — orphan test workflows.

Your PR may touch just a subset — the wave is scoped to whichever of the above files actually exists on your repo.

Verification

The cimas cleanup-orphan-files command only deletes files carrying the Cimas auto-generated header (# Auto-generated by Cimas: Do not edit it manually!), so hand-written or non-cimas-shape files are protected by construction. If your gem legitimately needs one of these files as non-cimas-managed, restore it in the same PR review.

Related

• Extends the 2026-07-05 orphan cleanup wave scoped to generate.yml (ci#347).
• --flatten-stale full auto-close of prior stale cleanup-orphans-* branches on this repo.

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