citefind: the references in a bibliography, and what could not be read off them

Cuts a reference list into entries — at the note numbers where there are any,
at the layout where there are not — and reads each as far as its punctuation
allows. Fields that would not parse are named in `unsettled` rather than
guessed at, and `--prompt` asks a model about exactly those and no others.

Over 202 real reference sections from the corpus: 8,566 references, 95% with
a title, 82% with a year, 46% settling every field with no model involved.
A title is refused where the entry was never divided, so no record reports
its own text back as the work it cites.

`ibid.` is flagged and left alone — it points at a work, and the entry does
not say which. A rule of dashes is filled in, because the style defines it as
the author above.

chunkmd gains `note_starts` and `cites_something`: recognising a page of
notes and splitting one are the same knowledge, and two copies of that
pattern would drift.

Cargo.lock

@@ -254,6 +254,7 @@ version = "0.1.0"
 dependencies = [
  "booksniff",
  "chunkmd",
+ "citefind",
  "corpus-core",
  "cuekit",
  "cuepack",
@@ -328,6 +329,21 @@ dependencies = [
  "inout",
 ]
 
+[[package]]
+name = "citefind"
+version = "0.1.0"
+dependencies = [
+ "catena-cli",
+ "chunkmd",
+ "clap",
+ "corpus-core",
+ "idnorm",
+ "regex",
+ "schemars",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "clap"
 version = "4.6.7"