Slice 4.2. The receipt duty from ADR-0024 was built yesterday on the
premise that "the error is forgetting, not doing it wrong". The same
upgrade falsified that on the same day: the receipt for schema.yaml was
written, it is truthful, it names correctly what was carried over - and two
fields were lost anyway. Nobody forgot anything.
pruefe_upstream_drift.py now holds our schema.yaml structurally against the
baseline: every type, field, enum value and required entry the baseline
carries must exist here. Adding is allowed, losing is not. Checked
counterfactually against the real loss, which it reports.
For the two other extended files there is no equivalent - they are Python,
and no structural comparison exists. That half stays open and is written
down rather than glossed over.
Building it taught the check two things about itself. It broke the existing
selftest because that fixture wrote schema.yaml as prose - the same
unrealistic fixture FB-12 already records as having made an assertion
worthless for this very script. And my counter-control reported "nothing"
for the removed crash guard, because a crash returns the same exit code as
a failure; only checking for a traceback showed the script never reaches
its summary without it. Both times the control was blunt, not the check.
Sixteen assertions, six deliberate breaks, none uncovered.
The occasion is recorded for the next harvest as two stolpersteine pages -
the first use of the mechanism ADR-0009 decided: a receipt certifies
attention rather than completeness, and a file cannot be authoritative and
immutable at once.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01F2Q4Ri8NGwyTZzScvKnWFM
Thore CimbalandClaude Opus 5
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