fix(citation): represent chapter-crossing verse ranges (W4)

Parse.verse_range's [last] endpoint gains an optional chapter
(Parse.verse_end: { chapter : int option; verse : verse_num }), so a
hyphen range whose two endpoints lie in different chapters
("1 John 1:5-2:2") can be represented at all. Rejected: a bare
[int option] living alongside [last] as a second field on
verse_range -- that would let 'a chapter with no verse' exist as a
constructible value.

parse_part now splits a part's leading "chapter:" at the FIRST
colon only (not every colon), so the verses side can itself carry a
second colon from a crossing range. parse_range detects a crossing
by checking whether the range's right-hand side contains ':', and
skips the same-chapter descending-range guard for that case (a later
chapter is always "ahead", whatever its own verse numbers are).
Handles the compound shape too -- a crossing range followed by
further, same-chapter verse references in the same comma list
("Matthew 9:35-10:1,5a,6-8") -- since those trailing pieces parse as
ordinary bare verses/ranges, unaffected by the preceding crossing.

Render's one_range renders a crossing [last] through the same
chapter_verse template one_part already uses for the part's own
leading "chapter:verses", so a style that reconfigures the
chapter/verse separator renders a crossing endpoint in that same
convention rather than a hardcoded ':'.

This closes the W4 known-wrong: 41 (now 49, after an intervening
Second-reading extraction) of the OF lectionary's citations printed
unconverted, every one this exact shape. test_citation_coverage_of.ml's
pinned residual is now empty and asserted exactly, over the full
1725-field data/of/lectionary.sexp population, including the round-trip
check (parse -> render -> parse structural equality). test_citation.ml
gains direct parse-suite cases for the basic crossing, the compound
shape, a mid-list crossing, a crossing with a sub-verse letter, and a
malformed-crossing rejection.

data/of/lectionary.sexp is regenerated via its own generator
(tools/bootstrap_lectionary_of.ml, whose own embedded header text is
updated to match); only comment lines change, confirmed by diff --
no lectionary entry differs. test_lectionary_of.ml's whole-file
SHA-256 pin is updated to match.

EF is unaffected: data/ef/ is untouched since v1.0.0, and a direct
byte comparison of `colitur day`/`colitur readings` for 2026, 1583
and 9999 against a git-worktree build of 1c0137d is identical on all
six outputs.

1 files changed, 10 insertions, 2 deletions

diff --git a/test/test_lectionary_of.ml b/test/test_lectionary_of.ml
index 706ee15..dc02176 100644
--- a/test/test_lectionary_of.ml
+++ b/test/test_lectionary_of.ml
@@ -178,7 +178,15 @@ let sha256_of_file path =
    don't transcribe it from generator stdout" discipline
    test_calendar_of_data.ml's own [test_sha256] already follows. *)
 let test_sha256_pinned () =
-  (* Fix wave I8 (final-review.md, 2026-08-25-colitur-of-phases-3-5): the
+  (* W4 (this task): header-only change, same discipline as I2 below --
+     {!Colitur_citation.Parse.verse_end} closed the chapter-crossing gap,
+     so the residual the header's own COVERAGE (4) and the trailing
+     "Citations that do not parse" listing disclose went from 49 to 0. No
+     lectionary ENTRY changed (`git diff --stat` on this file shows only
+     comment lines). Re-derived with `sha256sum data/of/lectionary.sexp`,
+     same discipline.
+
+     Fix wave I8 (final-review.md, 2026-08-25-colitur-of-phases-3-5): the
      hash changed again -- ONE genuine new entry this time ("of-nativity",
      the Christmas Day Mass hand-authored from OLM 1981; see
      test_coverage_2026's own citation), not header-only as the I2 change
@@ -193,7 +201,7 @@ let test_sha256_pinned () =
      and test_citation_coverage_of.ml), and the header's "Epistle" wording
      is fixed to "First". Re-derived the same way, same discipline. *)
   Alcotest.(check string) "data/of/lectionary.sexp SHA-256"
-    "0d82069e879d8312943dee543aabc23208265534fcf7edd85c3d9137c2f4581d" (sha256_of_file lectionary_path)
+    "788ddc6d2d783286b6e64882a5372ae213cd5462c887e68aa2bea22388cdb4f7" (sha256_of_file lectionary_path)
 
 (* lectio's OWN of-lectionary.ini SHA-256, pinned inside data/of/
    lectionary.sexp's own provenance header (tools/bootstrap_lectionary_of