Revert template_roi_tree cache bucket rename from v1.13.3

v1.13.3 renamed the @with_solr_cache bucket from 'template_roi_tree' to
'template_roi_tree_v2' to dodge v1.13.2 stale entries with the narrower
walk. Robbie flagged this as overkill — the rename orphans the previous
bucket in SOLR for 90 days, and force_refresh on the 10 affected
templates does the same job surgically.

Reverts the decorator name in both vfb_queries.get_template_roi_tree
and cached_functions.get_template_roi_tree_cached back to
'template_roi_tree'. The Cypher walk (innervates + unbounded depth) and
the painted_domain_index class_label fallback from v1.13.3 are
unchanged.

Post-deploy: the run.sh accompanying this release fires
?force_refresh=true against each of the 10 production templates so the
v1.13.2-shape entries still cached under 'template_roi_tree' (the
canonical bucket) get overwritten with v1.13.4 results. The orphaned
'template_roi_tree_v2' entries from v1.13.3 will TTL out in 90 days;
nothing reads from them.

No __version__ bump.

Author: Robbie1977

src/vfbquery/cached_functions.py

@@ -325,7 +325,7 @@ def get_painted_domains_cached(template_short_form: str, return_dataframe=True,
     """
     return _original_get_painted_domains(template_short_form=template_short_form, return_dataframe=return_dataframe, limit=limit)
 
-@with_solr_cache('template_roi_tree_v2')
+@with_solr_cache('template_roi_tree')
 def get_template_roi_tree_cached(template_short_form: str, return_dataframe: bool = False, force_refresh: bool = False):
     """
     Enhanced get_template_roi_tree with SOLR caching.

src/vfbquery/vfb_queries.py

@@ -4883,7 +4883,7 @@ def get_painted_domains(template_short_form: str, return_dataframe=True, limit:
 _VFB_SHORT_FORM_RE = re.compile(r"^[A-Za-z0-9_]+$")
 
 
-@with_solr_cache('template_roi_tree_v2')
+@with_solr_cache('template_roi_tree')
 def get_template_roi_tree(template_short_form: str, return_dataframe=False):
     """Build a hierarchical ROI tree for a template.
 
@@ -4895,12 +4895,7 @@ def get_template_roi_tree(template_short_form: str, return_dataframe=False):
     on this template, materialising the nodes and edges required to
     render the tree. ``innervates`` is what connects e.g. the adult VNC
     nerves (which are part_of the peripheral nervous system, NOT the
-    central VNC) to the neuromeres they innervate, so without it the
-    legacy walk dropped 16 of the 22 painted VNS nerves from the tree.
-
-    Cache bucket ``template_roi_tree_v2`` (was ``template_roi_tree``)
-    forces a clean re-populate so v1.13.2 entries with the narrower
-    rel-set don't shadow the new walk.
+    central VNC) to the neuromeres they innervate.
 
     FBbt's DAG character is preserved (multi-parent classes appear under
     each parent), matching the legacy VFBTree behaviour.