half-past hours parse as the hour being entered (V-538)

Russian names a half hour by the hour it is entering, in the genitive, so
"половина восьмого" is 07:30 and never 08:30. Neither date parser read that
shape, so the reminder parsed to nothing.

rewriteHalfPast runs in front of the token pass in SpellOutDigits, so the
python parser and the stub both see "в 7:30". It also reads the contracted
"полвосьмого" and the quarter-to shape "без четверти восемь", which counts
from a cardinal and is 07:45. Minus one is in one place, clockHourBefore, with
twelve rather than zero before one.

Ordinals eleven and twelve added to the lexicon, because a clock reaches them.
Minutes a spoken clock does not use are left alone: a guess here is a missed
dose.

Classifier + onnx over the routing fixture 58/82 to 62/87, three new cases,
none regressed. Python dateparser is not installed on this host, so only the
stub was measured. See docs/evals/2026-08-05-half-past-hours.md.

internal/lexicon/lexicon_ru_v1.json

@@ -38,7 +38,7 @@
       ]
     },
     "ordinals": {
-      "note": "Position words, as spoken, with the gender and oblique forms Russian requires: \"отметь второй пункт\" and \"закрепи вторым\" name one position (Vikunja #516). Values are the 1-based position, and -1 is the last one, which is a position rather than a count. The genitive forms here are also what a half-past hour needs (\"в половине восьмого\", V-538), so this set is written for two callers.",
+      "note": "Position words, as spoken, with the gender and oblique forms Russian requires: \"отметь второй пункт\" and \"закрепи вторым\" name one position (Vikunja #516). Values are the 1-based position, and -1 is the last one, which is a position rather than a count. The genitive forms here are also what a half-past hour needs (\"в половине восьмого\", V-538), so this set is written for two callers. It runs to twelve rather than ten because a clock does: \"в половине двенадцатого\" is 11:30.",
       "values": {
         "первый": 1, "первая": 1, "первое": 1, "первого": 1, "первую": 1, "первым": 1, "первой": 1, "first": 1,
         "второй": 2, "вторая": 2, "второе": 2, "второго": 2, "вторую": 2, "вторым": 2, "second": 2,
@@ -50,6 +50,8 @@
         "восьмой": 8, "восьмая": 8, "восьмое": 8, "восьмого": 8, "восьмую": 8, "восьмым": 8, "eighth": 8,
         "девятый": 9, "девятая": 9, "девятое": 9, "девятого": 9, "девятую": 9, "девятым": 9, "ninth": 9,
         "десятый": 10, "десятая": 10, "десятое": 10, "десятого": 10, "десятую": 10, "десятым": 10, "tenth": 10,
+        "одиннадцатый": 11, "одиннадцатая": 11, "одиннадцатое": 11, "одиннадцатого": 11, "одиннадцатую": 11, "одиннадцатым": 11, "eleventh": 11,
+        "двенадцатый": 12, "двенадцатая": 12, "двенадцатое": 12, "двенадцатого": 12, "двенадцатую": 12, "двенадцатым": 12, "twelfth": 12,
         "последний": -1, "последняя": -1, "последнее": -1, "последнего": -1, "последнюю": -1, "последним": -1, "last": -1
       }
     },