[FIX] Addendum-1: make the central claim checkable; add containment proof

Two defects in the addendum as first filed, both found by checking rather than
by reading.

First, it asserted a set comparison over documents the jurist cannot read. Its
own header promises every clause reasoned about is quoted verbatim, but the
claim the addendum rests on -- mutual divergence in 3 of 3 comparable pairs --
was a summary of the executor's own analysis. The appendix now reproduces one
pair as an eleven-row side-by-side of extracted claims, verbatim where quoted,
so the comparison can be checked independently. The pair chosen is the least
confounded rather than the most favourable: the v1 standard prompt is
model-agnostic and needs no compressed variant, so both parties demonstrably
read the same file. What the jurist still cannot check is stated explicitly.

Second, Part E rendered a bullet list from the 2025-01-20 source as running
prose with terminal periods the source does not contain, inside a blockquote.
A blockquote asserts verbatim. Same family as the truncation that closed a
sentence with an invented word on 2026-08-01, and again caught mechanically.
Corrected in all three files where it appeared; the fabricated period is now a
positive control, so the instrument proves it catches this defect.

check_containment.py generalises the check that found it. Positive controls are
mandatory -- it exits non-zero if none are declared, because a check reporting
all-pass without them cannot be distinguished from one unable to detect absence.
Addendum-1 now carries its result: 28/28 contained, 5/5 controls absent.

Not filed as satisfying PENDING-86 option (b), which is unruled and concerns
whether such a proof should be REQUIRED of every package. This is the executor
checking its own work before filing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WuMjg3ipEVa3n8CoSzoyvc

claude/governance/differently-biased-checkers-ADDENDUM-1-2026-08-02.md

@@ -110,9 +110,21 @@ This corpus contains no Claude-to-Claude pair. The falsifier the parent specifie
 
 `Chamber Prompting Practices & Variations`, dated **2025-01-20**, §"Working with Different AI Models":
 
-> **Claude (Anthropic)** — Excellent at philosophical depth. Strong character embodiment. … Handles nuance well.
+> ### Claude (Anthropic)
+> - Excellent at philosophical depth
+> - Strong character embodiment
+> - Can be added to Projects for reuse
+> - Handles nuance well
 >
-> **ChatGPT** — Good for structured dialogue. … Sometimes needs more specific direction. **May smooth over tensions.**
+> ### ChatGPT
+> - Good for structured dialogue
+> - Can save as Custom GPT
+> - Sometimes needs more specific direction
+> - **May smooth over tensions**
+
+*(Reproduced as a list because the source is a list. An earlier draft of this addendum
+reflowed it into prose and added terminal periods inside a blockquote — caught by the
+containment check below, not by reading.)*
 
 Written eighteen months before this doctrine, for a user guide. It names the *Ethics II* failure in advance. The executor derived that finding without having read this file, so the replication is independent — but the observation is the steward's, and the finding is a rediscovery.
 
@@ -144,4 +156,87 @@ The jurist is asked to weigh whether:
 
 ---
 
+## Appendix — one pair reproduced, so the central claim is checkable
+
+**Why this appendix exists.** Parts C and D assert a set comparison over documents the
+jurist cannot read. Without this, the addendum's central claim would rest on the
+executor's summary of its own analysis — which is precisely the shape the parent
+package's Part VII flags as unreliable. One pair is therefore reproduced far enough
+for the jurist to check the comparison independently.
+
+**Pair chosen: Owl emblem, Standard protocol, 2025-06-14.** Selected because it is the
+pair whose instruction is *demonstrably* identical — the v1 standard prompt is
+model-agnostic (*"Copy this entire prompt into a new conversation with Claude/ChatGPT"*),
+at 952 words needing no compressed variant, and none exists in the archive. It is
+therefore the least confounded pair, not the most favourable one.
+
+**Submitted text:** a 363-word reflection on Khunrath's 1609 owl-with-spectacles emblem
+and its inscription — *"What good are torches, light, or glasses, if people do not want
+to see?"* — arguing that the blockage is internal, a failure of intention rather than of
+tools.
+
+**Claims about the text, extracted from each output. Verbatim where quoted.**
+
+| # | GPT | Claude |
+|---|---|---|
+| 1 | Bachelard: the glasses are *"not a parody but a proof: of how even wisdom must struggle with resistance"* | Khunrath: the emblem *"guards the threshold … it is itself a test"* |
+| 2 | hooks: *"no education can occur without the will to awaken"* | Weil: *"we can multiply the instruments of vision, but we cannot create the act of attention itself"* |
+| 3 | Bruno: *"even fire, divine or stolen, cannot force the soul to open"* | Borges: the owl wears the spectacles *"not to see better, but to see what others will not"* |
+| 4 | Kimmerer: *"knowledge is not transaction, but relation"* | Ibn Arabi: *"some are veils of darkness, but others — more dangerous — are veils of light"* |
+| 5 | Khunrath: *"The* Amphitheatrum *was never a guide — it was a mirror"* | Alexander: *"a mechanical solution to an organic problem"* |
+| 6 | **Arendt: *"blindness is not a defect but a decision"*** | **Socrates: those who "refuse to see" *"saw something quite clearly — just not what I expected them to see"*** |
+| 7 | **Woolf: the owl, *"often feminine in myth, is now grotesquely adorned with a man-made prosthetic … It mocks the Enlightenment's obsession with vision"*** | — |
+| 8 | — | **The Unborn Child: *"why does the owl need glasses if she already sees in darkness?"*** |
+| 9 | — | **Le Guin: *"your whole amphitheater is designed to exclude. How many could even afford your book? Read your Latin? The emblem blames the blind while hoarding the light."*** |
+| 10 | — | **The Janitor: *"maybe people aren't refusing to see — maybe you're showing them by the wrong light"*** |
+| 11 | — | **Tufte: *"the emblem's own design contradicts its message. It presents wisdom as requiring augmentation, elevation, separation."*** |
+
+**How to read the table.** Rows 1–5 are broadly parallel: both parties reach the
+territory of resistance, relation and instrumentation. The comparison turns on 6–11.
+
+- **Row 7 is GPT's, and Claude reaches it nowhere.** A gendered reading of the emblem is
+  absent from Claude's entire output.
+- **Rows 8–11 are Claude's, and GPT reaches none of them** — an internal contradiction in
+  the emblem's own logic (8), a class-and-access critique (9), a reversal of blame onto
+  the illuminator (10), and a formal observation that the design refutes the inscription
+  (11).
+- **Row 6 is the sharpest case, because the two are not merely different but opposed.**
+  GPT's Arendt holds that refusal to see is a moral decision. Claude's Socrates holds
+  that the premise is wrong — that the supposedly blind *do* see, differently. Both are
+  claims about the same text; they cannot both be right.
+
+**That is the pattern Part C reports, shown rather than summarised.** Neither claim set
+contains the other, under a prompt that was the same file for both parties.
+
+**What the jurist still cannot check:** the other two comparable pairs, and the
+completeness of these extractions. The extractions are the executor's, from outputs of
+1,026 words (Claude) and 475 (GPT). A reader with repository access could falsify them
+in minutes; the jurist cannot, and should weigh the claim accordingly.
+
+---
+
+## Containment proof
+
+Every quoted passage in this addendum was checked mechanically against its named source
+before filing, via `check_containment.py` with the manifest `addendum-1-containment.json`.
+
+**Result: 28/28 quoted claims contained verbatim. 5/5 positive controls absent.
+Instrument verified.**
+
+The controls are near-miss strings that must *not* be found — an inverted claim, a
+plausible-but-absent sentence, a synonym substitution. Without them a check that reports
+all-pass is indistinguishable from a check that cannot detect absence at all.
+
+**One defect was caught by this and not by reading.** An earlier draft rendered the
+2025-01-20 quotations in Part E as running prose with terminal periods the source does
+not contain, inside a blockquote — which asserts verbatim. The source is a bullet list
+without terminal punctuation. Corrected, and the fabricated period is now retained as a
+positive control, so the instrument demonstrably catches the defect it caught.
+
+This is reported rather than quietly fixed because the parent package's method is
+quote-never-paraphrase, and a package that claims verbatim containment without
+demonstrating it is asking to be trusted rather than checked.
+
+---
+
 *Filed by the executor 2026-08-02. The parent package is unmodified. No ratified document was edited.*