`docs/2026-09-04-k2-pptx-odt-rtf.md` measured the corpus denominator for
these three rows at zero, so K2 for them was unmeasured rather than
passing. This measures them on the synthetic set committed in `a7b050b`,
whose hand count landed BEFORE any of these numbers existed.
Coverage 59/59 and pairing 20/20 for all three, standalone and product
alike, where "product" is scored off the persisted concept in the bundle
rather than an intermediate. The instrument's own denominator, derived
from each file's XML or stream, agrees with the hand count on all three:
59 strings, 20 pairable. Door B over the fixture directory persists 3/3
with nothing quarantined, rejected, failed or skipped, so K1b holds at
3 = N. There is no sub-100 % cell to explain, and that is a result about
three documents we wrote, not about the formats.
THE NEGATIVE CONTROL IS WHAT MAKES THOSE FIGURES MEAN ANYTHING. Removing
one label and its value from each converted text moves every row to
57/59 and 19/20 -- exactly the two strings and the one pair taken away.
`tests/test_fidelity.py` carries that control per reader, so it cannot
rot into a claim.
The order names `okf_fidelity` as the instrument and the instrument
refused all three types (`no source-string reader for '.pptx'`), so step
2 could not run without readers for them. Added here, stated in the
report as sitting outside the order's enumerated fence: this is the
measuring instrument, not extraction code. `extract.py` is untouched and
every `_EVIDENCE` row still reads `unmeasured` -- three synthetic
documents in one house style are exercise, not coverage, and the suite
asserts the rows are not promoted.
Two converter findings, reported and not fixed, both exit code 0 with no
warning. RTF cell paragraphs without `\pard\intbl` are read as each row
nested inside the previous one, 2076 characters where 117 were expected.
And the `\uN?` unicode escape -- THE FORM WORD EMITS -- loses the
character after it: `A\u248?BC` reads back as `AoC`. Any Word-produced
RTF carrying Norwegian letters loses one character after each of them,
silently. That is now a named limit of the `rtf` row rather than an
unknown.
Pandoc 3.9 and the host's 3.10.2 produce byte-identical output for all
three fixtures, so the numbers are not sitting on a version-fragile edge.
`~/corpora/` was neither read nor written; N there is still 43.
Suite 1141 passed, `ruff` clean, `mypy --strict src/ tools/` clean over
25 files, all after `git add`. Regenerating the fixtures leaves
`git diff --quiet` clean.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Kjell Tore Guttormsen
bd44929c89