Decide and apply the next semver for a release. Triggers on "bump the version", "what version is next", "/bump-version", "простав версію", "яка наступна версія". Reads the next number from the deterministic scripts/next-version.sh (NEVER guesses it), explains in plain language WHICH part moved and why (e.g. "MINOR, because a feat landed: filter notes by tag"), edits the version line in pyproject.toml, and proposes the matching `git tag vX.Y.Z`. The number is decided by a rule; the agent explains and applies — the human confirms the tag. Never pushes a tag itself.
