session naming: archive- prefix convention + cc-ci-report unique-name invariant

- _archive_stale_titles default label is now 'archive-<title> —' (operator
  convention: all archived sessions start with archive- so they sort/filter
  together in the web UI).
- launch-report.py start() archives older cc-ci-report sessions before launch,
  same invariant as upgrader/supervisor (reuses the launch-upgrader helper).
- 33 sessions restyled/archived live; canonical names now unique:
  cc-ci-upgrader (idle finisher), cc-ci-report (generating), cc-ci-supervisor
  (none — only exists during a rescue).

cc-ci-plan/launch-report.py

@@ -70,6 +70,18 @@ def start(mode, date):
             log(f"{SESSION} busy with a report — leaving it"); return
         log(f"{SESSION} exists (idle/leftover) — killing first"); kill_session(); time.sleep(1)
 
+    # Unique-name invariant (same as upgrader/supervisor): archive-rename every older session
+    # titled SESSION so the one this launch creates is the ONLY 'cc-ci-report' in the web UI.
+    # Archived names start with 'archive-' (operator convention 2026-08-04).
+    try:
+        import importlib.util as _ilu
+        _spec = _ilu.spec_from_file_location(
+            "launch_upgrader", os.path.join(os.path.dirname(os.path.realpath(__file__)), "launch-upgrader.py"))
+        _lu = _ilu.module_from_spec(_spec); _spec.loader.exec_module(_lu)
+        _lu._archive_stale_titles(SESSION)
+    except Exception as e:
+        log(f"  (archive-rename skipped: {e})")
+
     kf = Path(LOG_DIR) / f".kickoff-{SESSION}.txt"
     kf.write_text(build_kickoff(date))
     model_flag = f"--model '{MODEL}'" if MODEL else ""

cc-ci-plan/launch-supervisor.py

@@ -101,7 +101,7 @@ def spawn_supervisor(sid, reason):
     # Unique-name invariant (same as the upgrader): archive-rename every older session titled
     # SUP_SESSION so the one this launch creates is the ONLY 'cc-ci-supervisor' in the web UI.
     try:
-        lu._archive_stale_titles(SUP_SESSION, "supervisor archive —")
+        lu._archive_stale_titles(SUP_SESSION)
     except Exception:
         pass
     kf = Path(LOG_DIR) / f".kickoff-{SUP_SESSION}.txt"

cc-ci-plan/launch-upgrader.py

@@ -293,7 +293,9 @@ def _archive_stale_titles(title=None, label=None):
     title lookup in _session_id() unambiguous. Old runs stay browsable under
     '<label> — <date>'. Also used by launch-supervisor.py for its own session name."""
     title = title or SESSION
-    label = label or ("upgrader archive — weekly" if title == "cc-ci-upgrader" else f"{title} archive —")
+    # Archive names always start with 'archive-' (operator convention 2026-08-04) so they
+    # sort/filter together in the web UI: 'archive-<original-title> — <date>'.
+    label = label or f"archive-{title} —"
     rows = _server_get("/session") or []
     rows = rows if isinstance(rows, list) else rows.get("data", [])
     for s in rows: