Progressive title truncation, publisher tiebreak, thematic-year fix

Long transcribed box titles that defeat search now retry with shorter
heads (pre-separator, pre-"Game ..." descriptor, first-two-words from
the pre-subtitle part) matched exact-only against the head — fuzzy
thresholds stay untouched. Tie-breaks gain a publisher pick: when the
box showed a publisher and exactly one exact-named candidate is from
that publisher, it wins (SPI's Sorcerer 1975 now beats the more-owned
White Wizard Sorcerer 2019). The extract prompt excludes thematic/
subject years from year_hint; re-extracting Flat Top's photo drops the
bogus 1942, and a regression test pins that a wrong year can never
drive version selection. Re-extraction also drifted two transcriptions
(DUNGEON!, and Herbaceous misread as "Hebarceos") — fixtures added; the
misread demos review's re-search rescue in the end-to-end run.

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

tests/fixtures/bgg_cache/search_query=Blorvath-type=boardgame-2Cboardgameexpansion_48feb4349d.xml

@@ -0,0 +1 @@
+<items total="0"></items>

tests/fixtures/bgg_cache/search_query=DUNGEON-21-type=boardgame-2Cboardgameexpansion_f71cb1cc0c.xml

@@ -0,0 +1 @@
+<items total="1"><item type="boardgame" id="1339"><name type="primary" value="Dungeon!"/><yearpublished value="1975"/></item></items>

tests/fixtures/bgg_cache/search_query=Hebarceos-type=boardgame-2Cboardgameexpansion_b1b7b72de1.xml

@@ -0,0 +1 @@
+<items total="0"></items>