Releasing mergify-cli

Everything is driven by .github/workflows/release.yml. There is no version to bump in any file — pyproject.toml and Cargo.toml keep their placeholder versions and the workflow stamps the tag in at build time. Never open a "release prep" PR.

Versions are calver: YYYY.M.D.N (no zero padding, N starts at 1 each UTC day).

RELEASING.md at the repo root is the human-facing runbook and explains why the flow is shaped this way (GitHub's immutable-releases policy). Read it when something goes wrong or the workflow itself needs changing.

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