feat: let a size rejection be waived

A release below §5.5's floor was rejected with no way through, so a
policy wrong about one title left three Rick and Morty S09 packs
visible and none grabbable.

`allow_below_floor` relaxes the floor for one title into a soft fail,
never a pass: the release is waived, so automatic grabbing still skips
it and the import records a §5.7 waiver. The deck offers the one click
on a rejected row where the rule has an override, which is exactly what
§9.3's override is for.

Stored verdicts are re-derived when a title's overrides change — the
deck and the daemon's grab gate both read that column, so without it
the row the operator just acted on would keep reading `rejected`.

Closes #210

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

.sqlx/query-ad652cad9ca76a349b9257f7036e4af24a93f62b5c04b1a67ad8704f31c39d62.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "UPDATE releases SET verdict = ?, rejected_rule = ? WHERE id = ?",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 3
+    },
+    "nullable": []
+  },
+  "hash": "ad652cad9ca76a349b9257f7036e4af24a93f62b5c04b1a67ad8704f31c39d62"
+}