docs(guide): remove legacy SmartJournal reference

Reword journal Overview to drop the 'legacy SmartJournal dependency' mention
and remove smartjournal from the coverage-reconcile deprecated skip-list.
qds-monitor stays in the skip-list (deprecated, intentionally undocumented).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

scripts/coverage-reconcile.py

@@ -53,11 +53,11 @@ def main():
     for repo in sorted(glob.glob(os.path.join(ROOT, "hiveops-*"))):
         name = os.path.basename(repo)
         svc = name[len("hiveops-"):]
-        # non-service / special repos, and DEPRECATED ones (qds-monitor + smartjournal were the
-        # early incident bridge before the agent shipped — superseded, don't document)
+        # non-service / special repos, and the DEPRECATED qds-monitor (the early incident
+        # bridge before the agent shipped — superseded, don't document)
         if svc in ("agent","guide","bom","security-common","template","docs","release",
                    "devops","integration","tools","adoons",
-                   "qds-monitor","smartjournal"):  # last line = deprecated
+                   "qds-monitor"):  # last entry = deprecated
             continue
         if not os.path.isdir(repo) or not has_backend(repo):
             continue