ci/docs: drop current branch references after rename to rolling

Cleanup PR following the current→rolling default-branch rename. Drops
the now-stale current branch from workflow triggers, flips remaining
defaults, and updates documentation/templates.

Workflows:
- pr-mirror-repo-sync.yml: branches narrowed to [rolling]; workflow_dispatch
  default and choice list now rolling-only; sync_branch fallback flipped
  from 'current' to 'rolling'.
- check-open-prs-conflict.yml: dropped current from push.branches.
- update-version-tags.yml: dropped current from push.branches and from
  the case statement (now bare 'rolling) TAG=rolling').
- submodules.yml: renamed update_current job, branch
  update-dependencies-current, and the related commit/title strings to
  rolling.
- update-translations.yml: PR branch update-translations-current renamed
  to update-translations-rolling.
- ai-validation.yml: prompt example updated.

Docs/templates:
- docs/conf.py: READTHEDOCS_GIT_IDENTIFIER fallback flipped to 'rolling';
  comment block updated to describe the rolling branch (the user-facing
  "(current)" suffix is release-channel terminology and remains).
- README.md: branching-scheme section now describes rolling as the
  default branch, with a note about the rename date.
- .github/PULL_REQUEST_TEMPLATE.md: CONTRIBUTING link points at
  blob/rolling.

External @current refs to vyos/.github and vyos/vyos-cla-signatures are
left untouched — they reference those repos' default branches and are
unaffected by this repo's rename.

🤖 Generated by [robots](https://vyos.io)

1 files changed, 6 insertions, 4 deletions

diff --git a/docs/conf.py b/docs/conf.py
index 083482a8..ea3c5b61 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -29,12 +29,14 @@ author = u'VyOS maintainers and contributors'
 # The short X.Y version (rolling — next major; bumped at branch cut)
 version = u'rolling'
 
-# The full version, including alpha/beta/rc tags. The `current` branch
+# The full version, including alpha/beta/rc tags. The `rolling` branch
 # is the rolling tip and serves at /en/rolling/ on RTD; the literal
 # below is exposed in the page footer ("v: rolling (current)") and is
 # interpolated into _templates/llms.txt.j2 ("This documentation covers
 # {{ release }}."). Pin this to a value that names what the rolling
-# docs actually serve, not a stale LTS codename.
+# docs actually serve, not a stale LTS codename. The "(current)" suffix
+# is release-channel terminology for the current rolling release; it is
+# unrelated to the former branch name.
 release = u'rolling (current)'
 
 # -- General configuration ---------------------------------------------------
@@ -136,9 +138,9 @@ html_baseurl = 'https://docs.vyos.io/en/rolling/'
 
 _rtd_version_type = os.environ.get('READTHEDOCS_VERSION_TYPE', '')
 _github_version = (
-    os.environ.get('READTHEDOCS_GIT_COMMIT_HASH', 'current')
+    os.environ.get('READTHEDOCS_GIT_COMMIT_HASH', 'rolling')
     if _rtd_version_type == 'external'
-    else os.environ.get('READTHEDOCS_GIT_IDENTIFIER', 'current')
+    else os.environ.get('READTHEDOCS_GIT_IDENTIFIER', 'rolling')
 )
 
 html_context = {