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, 12 insertions, 1 deletions

diff --git a/lib/kernel/overlay_ini.ml b/lib/kernel/overlay_ini.ml
index 6b6249f..09f6d52 100644
--- a/lib/kernel/overlay_ini.ml
+++ b/lib/kernel/overlay_ini.ml
@@ -37,7 +37,18 @@ let parse_sections text =
           end
         else
           match String.index_opt line '=' with
-          | None -> err "line %d: %S is neither a [section] nor a key = value line" n line
+          | None ->
+              (* Echo at most a little of the line. Pointing at line N is
+                 what locates the problem; reproducing the whole line adds
+                 nothing and, when someone has pointed a --lang or --overlay
+                 flag at a file that is not a calendar at all, quietly
+                 copies that file's contents into stderr and any log
+                 collecting it. *)
+              let shown =
+                if String.length line > 40 then String.sub line 0 37 ^ "..."
+                else line
+              in
+              err "line %d: %S is neither a [section] nor a key = value line" n shown
           | Some i ->
               if !cur = None then
                 err "line %d: %S appears before any [section] header" n line