feat(lang): read [bible] and [sigla] sections

Lang reads a hardcoded list of section names and ignores anything else
silently, so without this a [bible] section would appear to work and do
nothing -- confirmed directly with a scratch executable: before this
change, of_string on text containing a [bible] section parsed without
error and Lang.keys came back empty, no trace of the section anywhere.

Lang.bible keeps the total-lookup contract every other lookup in this
module has: a miss returns the key itself, never the empty string.
Lang.sigla_fields returns the [sigla] section's raw fields, values
trimmed but still quoted, for Render.style_of_fields to unquote.

[bible] joins the keys reference set so lang --check reports missing
book names; [sigla] deliberately does not, being settings with working
defaults rather than translatable names -- adding it would make --check
demand five settings from every language file.

1 files changed, 22 insertions, 2 deletions

diff --git a/lib/naming/lang.ml b/lib/naming/lang.ml
index 2301513..f0fd989 100644
--- a/lib/naming/lang.ml
+++ b/lib/naming/lang.ml
@@ -16,6 +16,8 @@ type t = {
   colour : table;
   term : table;
   rite : table;
+  bible : table;
+  sigla : table;
   chain : t option;  (** consulted when this table misses *)
 }
 
@@ -35,6 +37,14 @@ let rank t k = get t (fun x -> x.rank) k
 let colour t k = get t (fun x -> x.colour) k
 let term t k = get t (fun x -> x.term) k
 let rite t k = get t (fun x -> x.rite) k
+let bible t k = get t (fun x -> x.bible) k
+
+(* Not routed through [get]/[chain]: [sigla] is a set of RENDER SETTINGS
+   (Render.style_of_fields), not a per-key translation lookup, and it has no
+   miss-returns-the-key contract to keep -- a caller with no [sigla] table at
+   all just gets []. Order does not matter to callers (Render.style_of_fields
+   reads them by name), so [SM.bindings] (alphabetical) is fine here. *)
+let sigla_fields t = SM.bindings t.sigla
 
 let weekday_key = [| "sunday"; "monday"; "tuesday"; "wednesday"; "thursday"; "friday"; "saturday" |]
 
@@ -65,7 +75,8 @@ let fallback_code t = t.fallback_code
 let raw =
   { code = "raw"; fallback_code = None; celebration = empty_table; weekday = empty_table;
     month = empty_table; month_abbr = empty_table; season = empty_table; rank = empty_table;
-    colour = empty_table; term = empty_table; rite = empty_table; chain = None }
+    colour = empty_table; term = empty_table; rite = empty_table; bible = empty_table;
+    sigla = empty_table; chain = None }
 
 let with_fallback t base = { t with chain = Some base }
 
@@ -107,12 +118,21 @@ let of_string text =
                colour = find "colour";
                term = find "term";
                rite = find "rite";
+               bible = find "bible";
+               sigla = find "sigla";
                chain = None })
 
+(* [bible] joins this reference set: it is translatable book names, so a file
+   lacking them is genuinely incomplete and [lang --check] should say so.
+   [sigla] deliberately does NOT: it is five citation-style settings with
+   working defaults (Render.default_style), not names a translator owes --
+   adding it here would make [--check] demand five settings from every
+   language file that has never needed them. *)
 let keys t =
   let qualify prefix m = SM.bindings m |> List.map (fun (k, v) -> (prefix ^ "." ^ k, v)) in
   List.concat
     [ qualify "celebration" t.celebration; qualify "weekday" t.weekday;
       qualify "month" t.month; qualify "month_abbr" t.month_abbr; qualify "season" t.season;
-      qualify "rank" t.rank; qualify "colour" t.colour; qualify "term" t.term; qualify "rite" t.rite ]
+      qualify "rank" t.rank; qualify "colour" t.colour; qualify "term" t.term; qualify "rite" t.rite;
+      qualify "bible" t.bible ]
   |> List.sort compare