chore: release v2.8.0

[cipherbox-release-bot]

🤖 I have created a release beep boop

2.8.0

2.8.0 (2026-09-30)

Features

• api: count completed republisher walks in republisher_walks_total (#2088) (bae613a)
• web-e2e: add the soak login-secret export tool and the staging runbook (#2089) (145ee94)

Bug Fixes

• api: spend the identity token at registration and drop the subject display column (#2092) (63a5491)
• engine: mark a bin index publish only once its PUT leaves (#2090) (ada161e)

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