Fix phantom "Important:" header stealing a taking-fire report's deadline

Turned out to be one bug, not two: "Answer by <time>" phrasing was
already covered by _TAKING_FIRE_TIME_RE ('before|by <time>'). The real
bug was the last-resort bare-"<Name>:" header fallback matching a
same-message "Important:" follow-up line as a brand new named entity
(nothing excluded common prose lead-ins), creating a bogus
Target#Important that stole the deadline into its own requested_time
instead of the real report's. Fixed with a blocklist on that fallback
rule (important/note/warning/attention/caution/alert/reminder/priority).
New regression test, 55 total passing.

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

tests/test_ocr.py

@@ -383,3 +383,33 @@ def test_infantry_taking_fire_bearing_distance_short_range():
     assert coord == Coord("H", 7, 8, 4)
     assert shell is Shell.HE
     assert requested_time == "10:17:37"
+
+
+def test_taking_fire_important_followup_line_does_not_steal_the_deadline():
+    """A real user-pasted message: a same-report "Important: ... Answer by
+    <time>" follow-up line was being misread as a brand new named entity
+    header (the last-resort bare-"<Name>:" fallback matched "Important:"
+    itself), creating a bogus Target#Important that stole the actual
+    report's own deadline into that wrong entry instead of the real
+    StrikeRequest. "Answer by <time>" is also a deadline phrasing
+    _TAKING_FIRE_TIME_RE already covers (any 'before'/'by <time>') --
+    once the phantom split stops happening, it resolves correctly with
+    no extra fix needed."""
+    text = ("Infantry#4 taking fire!\n"
+            "Requesting <u><b>TEAR Shell</b></u> first, then <u><b>HE Shell</b></u>,\n"
+            "at bearing <b>308°</b>, distance <b>1.86km</b> from our position, <b>N2 0:9</b>\n"
+            "<u>Important:</u> <u><b>TEAR Shell</b></u> first, then <u><b>HE Shell</b></u>.\n"
+            "Answer by <u>10:30:00</u>")
+    info = ocr.parse_text(text)
+
+    assert (TargetType.UNKNOWN, "Important") not in info.targets
+
+    assert (TargetType.INFANTRY, "4") in info.allies
+    assert (TargetType.INFANTRY, "4") not in info.targets
+
+    assert (TargetType.STRIKE_REQUEST, "Infantry4") in info.targets
+    _, _, coord, shell, requested_time = info.targets[(TargetType.STRIKE_REQUEST, "Infantry4")]
+    assert requested_time == "10:30:00"
+    # Known gap, not asserted as fixed here: only the FIRST shell of a
+    # "X first, then Y" sequence is captured -- see TODO.md.
+    assert shell is Shell.TEAR