ci: raise the semvertag floor to 0.10.0 in the wrappers and docs

[lesnik512]

The GitHub Action and the GitLab component pinned semvertag>=0.5.0,<1, and the GitLab and index quick-start snippets pinned >=0.1,<1. The docs now describe behaviour that only exists from 0.9.0 (v-prefixed tags, #93) and 0.10.0 (the decline statuses, #98). A fresh runner resolves the latest release anyway, but a floor that low lets a cached older version silently skip both.

Every uvx 'semvertag…' pin in action.yml, templates/semvertag.yml, README, docs/index.md and both provider guides is now >=0.10.0,<1. The GitLab dry-run section no longer tells readers to raise the floor for --dry-run, since the quick-start floor already covers it.

The descriptor gate's own minimum stays at 0.5.0: it guards "the floor supports --dry-run", which >=0.10.0 satisfies. Its below-floor fixture built the bad template by replacing >=0.5.0 in the shipped one; that now replaces >=0.10.0, or it would match nothing and stop testing anything.

Verified with just lint-ci, just test-ci (500 passed, 100% coverage), just adr-check and just docs-build.