correct: type mixed-case candidate tuple

Author: codex

src/codex32/cli.py

@@ -37,6 +37,7 @@
     recover_secret,
 )
 from codex32.correction import (
+    CorrectionCandidate,
     _best,
     _residue_low_discrimination,
     correct_worksheet_residue,
@@ -569,7 +570,8 @@ def _correct(
         candidate = None
     capture_layers: list[tuple[int, int]] = []
     if candidate is not None:
-        candidates, complete, deadline, ambiguous = (candidate,), True, None, False
+        candidates: tuple[CorrectionCandidate, ...] = (candidate,)
+        complete, deadline, ambiguous = True, None, False
     else:
         first_search = erased if erased != search_value else search_value
         retry_search = search_value if erased != search_value else None