D: ocda-read, the reader, over the library, of every form

One reader where there were two. sisudoc-ssp-reader read a .ssp and
sisudoc-ocda-db-reader a .ocda.db, each with its own parser; this one
is built on the library, so every mode reads a .ssp, a .ocda.db and a
.sisupod, and says the same thing of each. Its output modules are the
.ssp reader's, copied (the reader repositories are unchanged) and
moved onto the library's model, which was the reader's types renamed
and added to. From the database reader, --languages and --files.

  ocda-read [--tree|--outline|--html|--llm-text|--llm-jsonl|--images|
             --verify --image-dir=<d>|--languages|--files|
             --report-unknown|--validate] <file> [lang]

Two modes are about the file and say so: --files answers for a
.ocda.db, and --validate checks a .ssp as text and refuses anything
else. Where a file holds several languages and none is named, every
form reads the first and says so, where the database used to take one
and the pod refuse.

In src/read/ beside the library in src/ocda/; dub.json keeps it out of
the library (configurations "library" and "ocda-read"), and the flake
builds it as a package. The flake's default is now all three programs
in one bin/: built separately into the same result link, each replaced
the one before, and the pipeline's dump looked for ocda-dump where
only ocda-agree was left.

Checked over the 36 document-languages:
- against the .ssp reader, on a .ssp, byte for byte after the first
  line (Parsed: is Read:): --tree, --html, --llm-text, --llm-jsonl,
  --images, --verify, --validate, 36 of 36; the summary differs only
  in the closing hint, which names the two new modes;
- against the database reader, on a .ocda.db: --files 27 of 27, and
  --languages 27 of 27 on language, source and digest (its id column,
  the database's own key, is left out);
- the same output from the .ssp, the .ocda.db and the .sisupod: the
  summary and --tree, --html, --llm-text, --llm-jsonl, --images and
  --report-unknown, 36 of 36; --languages, .ocda.db == .sisupod 27 of
  27, and a single-language .ssp == its database, 26 of 26.

Not reproduced, deliberately: the database reader's --outline, which
ordered the headings by their position within their own section, so
that the toc and the "(skip)" headings of other sections fell among
the body's. --outline here is --tree.

(assisted by Claude-Code)

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