docs: make the GitHub Release part of cutting a release

The repo reached v0.12.0 with fourteen tags and zero GitHub Releases,
because every release had stopped after commit, tag and push. The user
noticed and asked for the backfill, then asked that it not happen again.

Records the whole procedure rather than the missing step alone, since
nothing had written it down: changelog section, version bump, signed
tag, push to both remotes, then `gh release create` with the body taken
from that version's changelog section rather than composed fresh.

Also records that the version choice follows semver on the user-visible
surface pre-1.0, which is why 0.12.0 was minor rather than patch, and
that the stale SlackBuild version is deliberately not part of this.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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