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_retrieval_gate.py

@@ -16,9 +16,8 @@ real set lives outside this repository. Row 7 is red where a mutant survives,
 and each survivor is printed with what it moved.
 
 THE PUBLIC ROWS RUN ON INVENTED MATERIAL ONLY (operator decision 2026-09-21).
-The test track built on material tied to the operator's employer -- the K2
-corpus and the two road-standard sets -- is retired: not re-measured, not
-frozen. Its row (9) and its sets' adapters are gone, and row 8 reads one
+The earlier test track -- the K2 corpus and two further reference sets -- is
+retired: not re-measured, not frozen. Its row (9) and its sets' adapters are gone, and row 8 reads one
 local set.
 
 THE FASIT IS AN INPUT, NEVER A CONSTANT HERE -- `tools/okf_consume_measure.py`
@@ -2262,8 +2261,8 @@ def read_real_set(name: str, path: Path, expected_sha256: str) -> QuestionSet:
 
     The adapter below is the whole of this gate's knowledge of it, and none of
     the question text ever reaches a tracked file here. Two more adapters, for
-    sets built on material tied to the operator's employer, were removed
-    2026-09-21 with the test track they belonged to.
+    the sets of a retired test track, were removed 2026-09-21 with the track
+    they belonged to.
     """
     raw = path.read_bytes()
     measured = hashlib.sha256(raw).hexdigest()
@@ -2343,8 +2342,8 @@ def read_hold_out_set(path: Path, expected_sha256: str) -> QuestionSet:
 #: The sets row 8 is the measurement of, by name: a run that hands over some
 #: of them has measured some of them, and the row says so. Left to
 #: `len(real)` the row came back `6 of 6 GREEN` on one set of three (PM's J2,
-#: 2026-09-19). One set since 2026-09-21, when the two built on material tied
-#: to the operator's employer were retired; the rule stays for the day a
+#: 2026-09-19). One set since 2026-09-21, when the two of a retired test track
+#: were removed; the rule stays for the day a
 #: second set joins.
 REQUIRED_REAL_SETS: tuple[str, ...] = ("wiki-20",)
 
@@ -2638,7 +2637,7 @@ def render(rows: Sequence[Row]) -> str:
 
 
 def _bundle_map(value: str) -> dict[str, Path]:
-    """`/a/bundle`, or `N100:2023=/a,N200:2024=/b` for a set spanning bundles."""
+    """`/a/bundle`, or `Q100:2023=/a,Q200:2024=/b` for a set spanning bundles."""
     if "=" not in value:
         return {"": Path(value).expanduser()}
     pairs = {}