test(fixtures): replace sector-specific example material with generic, fictitious examples — green

Every fixture, test document, tool example and document now uses an invented
kitchen-and-baking handbook series, written in this repository. The package's
behaviour is unchanged; src/ changes are comments and help text only.

- Generated fixtures are regenerated from their generators. Their structural
  counts are identical before and after: elements, images, rows, cells,
  headings, bookmarks and the witness inventory's per-document totals. The
  image-inbox and accounting documents are renamed kapittel-84-*.
- tools/okf_accounting_gate.py: the two options that named one real corpus
  each are replaced by a generic, repeatable --corpus PATH with no default.
  Row 5 compares the PDF pair alone. Gate verdict unchanged: RED rows 2, 3, 6.
- tools/okf_witness.py: the STS JSON reader for one publisher's delivery is
  removed, along with its three twins and five tests. The mutation harness
  loses W09.
- docs/: 13 dated reports that documented runs on a retired reference corpus
  are removed, and 40 are neutralized. Dead links are removed, and no new
  dangling path is introduced.
- The synthetic MCP-gate corpus and the residual probe words are neutral.

Valgt: keep the `okf quality --fasit` bar value (the measured fraction, one corpus) and
rewrite only its provenance, because the verdict stays unchanged and the
number names nothing.

Term check with the local list: 0 of 411 tracked files, 0 file names, 0 of
27 binary fixtures. Suite after git add: 2457 passed, 1 skipped. The base
tree had 2460 passed and 2 skipped; five tests went with the JSON reader and
four were added by the term check. ruff, ruff format and mypy --strict src/
are clean.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_error_codes.py

@@ -636,7 +636,7 @@ def run_segmented_inbox(tmp_path: Path, *, plan_overrides: dict[str, Any], **kwa
     inbox = tmp_path / "round"
     inbox.mkdir(parents=True, exist_ok=True)
     body = "Brannkonsept: krav til seksjonering.\n"
-    (inbox / "n500.md").write_text(body, encoding="utf-8", newline="")
+    (inbox / "q500.md").write_text(body, encoding="utf-8", newline="")
     payload = segmentation_payload(
         source_sha256=hashlib.sha256(body.encode("utf-8")).hexdigest(),
         entries=[segmentation_entry(span=[0, len(body)])],
@@ -815,7 +815,7 @@ def test_asset_pdf_unsupported() -> None:
     from llm_ingestion_okf.extract import extract_document
 
     data = (
-        Path(__file__).parent / "fixtures" / "image-inbox" / "prosess-84-tabell.pdf"
+        Path(__file__).parent / "fixtures" / "image-inbox" / "kapittel-84-tabell.pdf"
     ).read_bytes()
     stencil = data.replace(
         b"/BitsPerComponent 8 /Filter /FlateDecode", b"/BitsPerComponent 1 /Filter /FlateDecode", 1