feat: naming, localisation and the rebuilt printed output

colitur computed the calendar correctly and could not say what it had
computed. A printed ordo read ef-septuagesima-sunday-2 where a reader
expects Dominica in Sexagesima, and the wall calendar showed slugs in
every cell.

  lib/naming    a language table and a config file, both pure and total,
                parsing the INI reader Overlay_ini already had
  lang/         la.ini and en.ini -- 725 names, every one transcribed
                from the 1962 Missal and citing the line it came from
  templates     the ordo rebuilt as an A5 booklet: one week per page, a
                table of contents, framed days, a colour swatch; the wall
                calendar now fills its sheet instead of a quarter of it
  tools         check_citations.py verifies all 400 citations resolve,
                with 33 self-tests of its own

Names resolve through lang -> declared fallback -> the slug, so a partial
translation is usable from its first line and the fully degraded case is
the old output rather than a blank page.

colitur day and colitur readings are BYTE-IDENTICAL to before, verified
against main rather than asserted; --lang, --raw and the lang/config
subcommands are still to come, and man/colitur-templates.5 still
documents the pre-naming view, so writing a custom template needs the
source until that lands.

1 files changed, 60 insertions, 0 deletions

diff --git a/lib/naming/lang.mli b/lib/naming/lang.mli
new file mode 100644
index 0000000..36931d4
--- /dev/null
+++ b/lib/naming/lang.mli
@@ -0,0 +1,60 @@
+(** A language table: strings to strings, nothing more.
+
+    Knows nothing about calendars, dates or rites, and never touches the
+    filesystem -- callers hand it text. That is what lets every command use it
+    without the kernel learning about presentation.
+
+    Every lookup is TOTAL. A key with no entry returns THE KEY ITSELF, never the
+    empty string: a partial translation must be usable from its first line, and
+    an untranslated day must still print something a reader can act on. This is
+    also why the pre-naming output (bare slugs) is exactly what an empty table
+    produces -- the degraded case is the old behaviour, not a blank page. *)
+
+type t
+
+(** Parse INI text. Never raises. [Error] on a malformed file or a missing
+    [\[meta\] lang].
+
+    Two duplicate policies, both LAST-WINS:
+    - A section name repeated in the file (e.g. two [\[celebration\]]
+      blocks) has ALL of its blocks merged, not only the first -- a
+      595-entry hand-edited language file WILL grow duplicate section
+      headers as contributors append entries over time, and dropping a
+      later block would silently lose real translations.
+    - Where the same key appears more than once -- within one block or
+      across two of them -- the value from further down the file wins.
+
+    Both read the same order a reader would: later in the file overrides
+    earlier. This is the OPPOSITE direction from
+    {!Colitur_kernel.Overlay_ini.get} ([List.assoc_opt], first match) over
+    the very same [section.fields] shape -- the two modules resolve a
+    duplicate key in opposite directions, so do not assume one's behaviour
+    from the other's. *)
+val of_string : string -> (t, string) result
+
+val code : t -> string
+val fallback_code : t -> string option
+
+(** [with_fallback t base] resolves through [t] first, then [base], then the key. *)
+val with_fallback : t -> t -> t
+
+(** The identity table: every lookup returns its key. This is what [--raw] uses,
+    so raw output is one table passed around rather than a special case threaded
+    through every call site. *)
+val raw : t
+
+val celebration : t -> string -> string
+val season : t -> string -> string
+val rank : t -> string -> string
+val colour : t -> string -> string
+val term : t -> string -> string
+
+(** [weekday t n], 0 = Sunday. Out-of-range [n] returns [string_of_int n]. *)
+val weekday : t -> int -> string
+
+(** [month t n], 1 = January. Out-of-range [n] returns [string_of_int n]. *)
+val month : t -> int -> string
+
+(** Every (section-qualified key, value) pair, sorted. Used by [lang --dump] and
+    [lang --check]. Keys are qualified as e.g. ["celebration.ef-epiphany"]. *)
+val keys : t -> (string * string) list