feat(arr): reopen a language on subtitle delete

DESIGN.md §15 reads satisfaction off the files, so a `satisfied` attempt
row whose sidecar was just deleted by hand is a stale claim that hides
the gap from the reconcile loop's work list. `unsatisfy` withdraws only
that claim: the attempt count and timestamp stay, because the backoff is
a fact about what providers were already asked and a delete does not
un-ask them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.sqlx/query-31bed4c9097d6ea2ed189de48440bd0d882873d27450e5d177baed65c74fd7de.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "UPDATE subtitle_attempts\n         SET    state = 'wanted',\n                updated_at = strftime('%Y-%m-%dT%H:%M:%fZ', 'now')\n         WHERE  media_file_id = ? AND language = ? AND state = 'satisfied'",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "31bed4c9097d6ea2ed189de48440bd0d882873d27450e5d177baed65c74fd7de"
+}