scripts/releases/semver.STABLE_TAG accepted any-width majors, so
is_valid_version('2026.9.21') was True and docker.require_stable_tag /
stable.py / release.py admitted the legacy CalVer tags that
hermes_cli.source_releases and get_last_tag() already refused. A
workflow_call carrying GitHub's current 'latest' (v2026.9.21) would have
passed the docker publish gate.
hermes_cli.update_channel already owns the canary tag shape; it now owns
STABLE_TAG_RE too (three-digit major cap, no leading zeros, no suffix)
and every stable selector imports it. release.py drops its private
_SEMVER_TAG_RE + CalVer exclusion pair, which the capped major makes
redundant.
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