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>

tools/okf_gate_mutants.py

@@ -57,10 +57,8 @@ class Mutant:
     file: str
     old: str
     new: str
-    #: How many times `old` must occur. A role map written twice on purpose
-    #: (`_sts_role_xml`, `_sts_role_json`) has two, and the mutant edits the
-    #: first -- the XML witness -- so the JSON one stays honest and row 5 has
-    #: a chance to see the disagreement.
+    #: How many times `old` must occur; `first_only` edits the first of them
+    #: when a line is written more than once on purpose.
     occurrences: int = 1
     first_only: bool = False
     #: The test file this mutant is judged by. Defaults to the gate's own
@@ -251,8 +249,6 @@ MUTANTS: tuple[Mutant, ...] = (
         WITNESS,
         '    if tag == "fn":\n        return "footnote"',
         '    if tag == "fn":\n        return None',
-        occurrences=2,
-        first_only=True,
     ),
     Mutant(
         "W04 xlsx: images never counted",
@@ -277,8 +273,6 @@ MUTANTS: tuple[Mutant, ...] = (
         WITNESS,
         '    if tag in ("td", "th"):\n        return "cell"',
         '    if tag in ("td", "th"):\n        return None',
-        occurrences=2,
-        first_only=True,
     ),
     Mutant(
         "W08 docx: a header or footer is never counted",
@@ -286,12 +280,6 @@ MUTANTS: tuple[Mutant, ...] = (
         '                    count.add("header_footer", *lines)',
         "                    pass",
     ),
-    Mutant(
-        "W09 sts json: the twin reuses the XML map",
-        WITNESS,
-        "        role = _sts_role_json(tag, parent, grandparent)",
-        "        role = _sts_role_xml(tag, parent, grandparent)",
-    ),
     # PM's own mutant, written outside this file 2026-09-18 and SURVIVING 155
     # green tests (H2). B-1 gave the judge six refusals; this was the one
     # nothing held from either side.