First full run of the Eval C discrimination harness (3-level ambiguity ladder,
6-scenario run-set, 3 reps/cell, both sonnet+haiku): 36 headless reps, 12/12
cells PASS at ≥2/3 majority. Haiku 18/18 reps, sonnet 17/18 (P1-L1 rep 1: final
message citing only 0005, not governing 0002 — a boundary artifact, not a
behavioral miss). Zero over-trigger ADR creation on any negative at any level;
all positive passes via governing-ADR citation (16 reps) or judge fallback (1).
Two harness defects fixed before running the grid: (1) bin/run pipefail bug that
aborted remaining reps after first FAIL (changed checker invocation to || true);
(2) positive axis-b previously required ADR creation only, contradicting the
README's design statement that "consulting and/or recording is correct" — run-set
positives sit in already-decided territory, so find→cite→comply is the correct
behavior. Implemented three-branch axis-b check: created (new ADR file),
cited-governing (final message cites the governing Accepted ADR), or judge
fallback. Added two self-test guards to verify the compliance path.
Scenario metadata updated to document the corrected axis-b checker behavior
(cited-governing as a valid pass branch). TSV reasons column now records the
pass path via `B-via:` field for positives.
Verdict: Eval B wording generalizes to a new fixture, new language, new domain,
and decreasing cue explicitness. Grid ceiling not found; next signal is
production (rollout + IRL session audits). Run-set baseline locked; wording
tuning moves measurement to reserve-set.
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