fix: audit findings — parser strictness, name ambiguity, and errors

Found by auditing the shipped program rather than the diff.

The parser accepted OCaml integer-literal syntax, so "Luke 1_1:5" read as
chapter ELEVEN and "+5" as 5 -- a typo silently becoming a different
chapter, reachable through any user overlay. Numbers are now plain digits
and positive, and a descending range is rejected: 1:20-10 is always a
transcription error. No shipped citation changed.

FOUR PAIRS OF DIFFERENT BOOKS SHARED A FULL TITLE. 1 and 2 Corinthians
both rendered "Epistola ad Corinthios", as did Thessalonians, Timothy and
Peter -- 108 citations in 2027 alone that a reader cannot resolve to a
book. This is the Kings defect fixed earlier and not generalised. The
titles now carry their volume numeral, marked CONSTRUCTED, and a test
asserts no two books share a name -- while allowing the case where two
ids ARE the same book under different numbering, which a tradition
relates.

Spec section 8.5 is now delivered rather than merely recorded. Shipped
styles did not re-parse their own output: 32 of 52 Latin abbreviations
and 49 of 52 full titles failed, so a citation copied from colitur's own
output into an overlay was passed through untouched and printed in the
wrong language, silently. Every shipped name is registered as a spelling
and split_book learned multi-word titles by longest-token match. Now 0
of 52 fail beyond the same-book aliases.

Overlay errors were written for a compiler author: they named an OCaml
source file the reader does not have and buried the useful token. The
existing five-path rewriter is replaced by a generic one, applied to
every load path rather than one, so "rank: is not one of the allowed
values (at Class9)" replaces the raw Of_sexp_error dump.

Also: the new-overlay scaffold documented citations and layer without
showing them, and its comment implied the wrong nesting -- the single
easiest thing to get wrong; error messages echoed whole file lines,
copying an unrelated file's contents into stderr when a flag pointed at
one; and config --show validated partway down its table, exiting 2 after
writing five rows to stdout.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/kernel/layer.ml b/lib/kernel/layer.ml
index ec074a7..f069546 100644
--- a/lib/kernel/layer.ml
+++ b/lib/kernel/layer.ml
@@ -85,11 +85,11 @@ let load rank_of_sexp path =
      unterminated list or string) rather than [Sexplib.Sexp.Parse_error], so a
      catch-all here -- placed last among the exception branches -- is what
      actually keeps every parse failure inside [Error] instead of escaping. *)
-  | exception exn -> Error (Printf.sprintf "%s: %s" path (Printexc.to_string exn))
+  | exception exn -> Error (Printf.sprintf "%s: %s" path (Sexp_error.humanise (Printexc.to_string exn)))
   | sexp -> (
       match t_of_sexp rank_of_sexp sexp with
       | t -> Ok { t with entries = canonical t.entries }
       (* [rank_of_sexp] is caller-supplied and may raise anything, not only
          [Of_sexp_error] -- mirrors [Overlay.load]'s catch-all, so "never as
          an exception" (layer.mli) actually holds. *)
-      | exception exn -> Error (Printf.sprintf "%s: %s" path (Printexc.to_string exn)))
+      | exception exn -> Error (Printf.sprintf "%s: %s" path (Sexp_error.humanise (Printexc.to_string exn))))