ci(release): advance seeded prereleases daily at Zurich time

[SDAChess]

Summary

Advance an explicitly seeded pre-release series daily at 16:00 Europe/Zurich, including daylight saving changes. Without a matching vX.Y.Z-pre.1, the workflow creates no tag and never guesses whether the next release is a minor or patch.

Related Issue

No issue required: localized maintenance of the existing release auto-tag workflow, replacing automatic patch selection with maintainer-seeded pre-release increments.

Changes

• Schedule the existing workflow daily and always check out main.
• Increment the highest release series only when its seed exists, its stable tag is absent, and new commits exist; reject candidates outside main's ancestry.
• Preserve explicit Release Tag dispatch after pushing the new tag and document the workflow.

Testing

• Executed the workflow's Bash selection block against 12 temporary Git repository cases: empty tags, stable-only tags, missing seed, minor series, patch series, numeric ordering, pre.9 rollover, completed series, newer stable release, unchanged HEAD, unrelated tags, and non-ancestor rejection.
• Actionlint passes for the updated workflow.
• git diff --check passes.
• mise run pre-commit and mise run ci could not start because mise is not installed. Pre-commit was explicitly waived by the requester.
• No remote release tags were created during testing.

Checklist

• Follows Conventional Commits.
• Commit is signed off (DCO).
• Architecture documentation updated.

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