.ssp: doc structure related fixes (& to epub toc_nav)

for document abstraction and its .ssp output, removed the
requirement of including --abstraction & --serial flags to produce
correct output (for: .dom_status, .dom_status_collapsed &
.last_descendant)

- meta_processing_xml_dom() includes show_abstraction, so --pod2
  and --show-abstraction run the dom pass; last_descendant is
  derived from that pass via after_doc_get_descendants()

The accumulators are now verified as eight wide locals of
docAbstraction(), so each document starts clean and no two threads
share one.
- bug: the four dom accumulators were template scope (shared) and
  nine wide, while their end of document reset was eight wide, so
  the first document of a run differed from the rest and parallel
  runs raced on one buffer, (which also mis-nested epub toc_nav)

test/ reference .ssp regenerated: accelerando only, trailing zero
dropped.
test-abstraction-ssp.sh now runs parallel and diffs output against
a serial run.

(assisted by Claude-Code)

3 files changed, 7 insertions, 8 deletions

diff --git a/src/sisudoc/ocda/meta/metadoc_from_src.d b/src/sisudoc/ocda/meta/metadoc_from_src.d
index e104c94..7fcf3bb 100644
--- a/src/sisudoc/ocda/meta/metadoc_from_src.d
+++ b/src/sisudoc/ocda/meta/metadoc_from_src.d
@@ -136,6 +136,11 @@ template docAbstraction() {
       "end"   : ""
     ];
     string[] lv_ancestors_txt = [ "", "", "", "", "", "", "", "", ];
+    /+ ↓ dom structure state, per document (not shared, parallel safe) +/
+    int[] dom_structure_markedup_tags_status         = [ 0, 0, 0, 0, 0, 0, 0, 0,];
+    int[] dom_structure_markedup_tags_status_buffer  = [ 0, 0, 0, 0, 0, 0, 0, 0,];
+    int[] dom_structure_collapsed_tags_status        = [ 0, 0, 0, 0, 0, 0, 0, 0,];
+    int[] dom_structure_collapsed_tags_status_buffer = [ 0, 0, 0, 0, 0, 0, 0, 0,];
     int[string] lv = [
       "lv" : eN.bi.off,
       "h0" : eN.bi.off,
@@ -1506,10 +1511,6 @@ template docAbstraction() {
     html_segnames_ptr                           = 0;
     html_segnames_ptr_cntr                      = 0;
     content_non_header                          = "8";
-    dom_structure_markedup_tags_status          = [ 0, 0, 0, 0, 0, 0, 0, 0,];
-    dom_structure_markedup_tags_status_buffer   = [ 0, 0, 0, 0, 0, 0, 0, 0,];
-    dom_structure_collapsed_tags_status         = [ 0, 0, 0, 0, 0, 0, 0, 0,];
-    dom_structure_collapsed_tags_status_buffer  = [ 0, 0, 0, 0, 0, 0, 0, 0,];
     lev_anchor_tag = "";
     anchor_tag = "";
     // identify parts
diff --git a/src/sisudoc/ocda/meta/metadoc_from_src_functions.d b/src/sisudoc/ocda/meta/metadoc_from_src_functions.d
index 9824d61..cf46fda 100644
--- a/src/sisudoc/ocda/meta/metadoc_from_src_functions.d
+++ b/src/sisudoc/ocda/meta/metadoc_from_src_functions.d
@@ -90,10 +90,6 @@ template docAbstractionFunctions() {
   // ocn
   OCNset obj_cite_digits;
   int obj_cite_digit_, obj_cite_digit_off, obj_cite_digit_bkidx, obj_cite_digit_type;
-  int[] dom_structure_markedup_tags_status         = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
-  int[] dom_structure_markedup_tags_status_buffer  = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
-  int[] dom_structure_collapsed_tags_status        = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
-  int[] dom_structure_collapsed_tags_status_buffer = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
   static auto obj_im = ObjInlineMarkup();
   static auto obj_att = ObjAttributes();
   auto object_citation_number = OCNemitter();
diff --git a/src/sisudoc/spine.d b/src/sisudoc/spine.d
index c80814e..17950d0 100644
--- a/src/sisudoc/spine.d
+++ b/src/sisudoc/spine.d
@@ -821,6 +821,8 @@ string program_name = "spine";
     @trusted bool meta_processing_xml_dom() {
       return (
         opts["abstraction"]
+        || show_abstraction
+        || show_abstraction_db
         || html
         || epub
         || odt