fix(500): the section-hold marker is a ledger by name, so a compaction sweeps it

The marker scribe_reply_check.sh writes after a completion-section hold sat in
the swept ledger directory as `<sid>.reportcheck`, and the sweep matches
`.ids` - test_every_session_file_in_a_swept_directory_follows_the_convention
caught it (run 799). Renamed `<sid>.reportcheck.ids` and added to the roster.
#5496.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_session_ledger_clear.py

@@ -58,7 +58,7 @@ DEFS = HOOKS / "scribe_defs.sh"
 # the convention tests below are what keep this roster honest as it grows.
 LEDGERS = {
     "scribe-priorart": (".ids", ".rules.ids", ".opened.ids", ".sync.ids",
-                        ".derive.ids", ".shapes.ids"),
+                        ".derive.ids", ".shapes.ids", ".reportcheck.ids"),
     "scribe-autoinject": (".ids",),
 }