board: backfill the four missing arc entries (#862/#875/#876/#879) + the pattern they share - #882
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…the pattern they share Closes the gap recorded one PR earlier. Each entry is marked RECONSTRUCTED with its sources (PR body, merged diff stats, merge commit, and — for #875/#876/#879 — this session's direct authorship or full-diff review). Forensic method per the 2026-07-27 precedent: never inference. Arc is now unbroken #880 -> #879 -> #876 -> #875 -> #862 -> #856. Also appends a dated correction to #880's arc-gap note: 'queued, not done' held for about an hour before the operator ruled the backfill belongs to the session still holding the context. New EPIPHANIES entry E-THE-DEFECTS-LIVE-IN-THE-FALSIFIERS-NOT-THE-MEASUREMENTS-1, which only became visible by writing the three probe entries together: across those PRs and ~a dozen review findings, every defect was in a falsifier or a label and none in a measurement. Carries the three concrete shapes (a permutation that isn't one; a window too narrow to be real; a threshold that cannot bite), the compounding case where fixing a falsifier reproduced the error one level up, and the CI corollary that cargo test never runs an example's main() so those asserts were decorative until #862 wired them. Fenced honestly: absence of review-found measurement defects is not proof the measurements were right. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K3RyLEbuNSHxxB3NTTrGki
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…tatistics work as C1b Post-merge hygiene, written on merge rather than as later cleanup (the delay is the anti-pattern the arc's own recovery note documents). Arc entries for #881, #882 and #883, plus the matching LATEST_STATE entry. The #883 entry records the ruling in its canonical wording: #879 is the complete and independent production phase-progression path; KanbanActor has no assigned architectural responsibility and its presence designates it as the future home of nothing. It also records the separation that must not blur -- MulAdvance and drive_mul_advance are legacy actor-message WRAPPERS, not the canonical MUL reasoning engine; gate_decision_i4 is independent, consumed directly by the #879 path, and not deprecated; the NARS recipes and awareness rung ladder are separate and untouched. The spawn inventory is recorded as deletion-impact evidence and a removal work-list only, with no architectural legitimacy. Restores the statistics scope that was deliberately removed from #883, now as its own deliverable rather than mixed into a legacy-surface correction: - C1 result: jc is in-tree; reliability.rs ships pearson / spearman / cronbach_alpha / icc (Icc2_1, Icc3_1), plus jirak.rs for the C4 noise floors. phi = pearson on two binary variables and KR-20 = alpha on dichotomous items, so those two renames are reporting work, not new math. kappa is absent from jc entirely -- the real gap, and it blocks D3's fusion falsifier. - C1b: kappa + McDonald's omega + effect size (Effektstärke), ADDITIVE ONLY. pearson/spearman/cronbach_alpha/icc stay untouched; any diff editing an existing jc statistic is an automatic reject, independent of merit. - C2 corrected: kappa is a SEPARATE estimator, not a renamed ICC. ICC stays ICC for the non-binary escalation only. No code, no runtime behaviour, no actor content. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K3RyLEbuNSHxxB3NTTrGki
#884 was itself the post-merge hygiene PR for #881/#882/#883 — and it merged without its own arc entry, reproducing one level up exactly the gap it was written to close. Writing the hygiene PR does not discharge the rule for the hygiene PR. Entry added, with that noted in it. Records what #884 locked: - The C1 audit finding: phi = pearson-on-binaries and KR-20 = alpha-on-dichotomous are the SAME computations already in jc (named wrapper + caveat only, arithmetic not re-implemented); kappa is absent and is NOT a renamed ICC — the real gap, and the one that blocks D3's fusion falsifier. - Effect size means the r-family: R, R-squared, eta-squared, phi. Cohen's d explicitly out, calculated separately if ever wanted. The t-test is the significance companion to eta-squared, not a d-family route. - ADDITIVE ONLY with one carve-out: existing jc statistics keep their arithmetic, signature and semantics; the sole permitted edit to an existing file is widening reliability.rs's private helpers to pub(crate) for reuse — visibility only. - The transport-vs-engine separation carried from #883, and that the spawn inventory carries no architectural legitimacy. Board prose only. D-KIA-C1b remains Queued. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01K3RyLEbuNSHxxB3NTTrGki
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Summary
Closes the arc gap recorded one PR earlier (#881). The
PR_ARC_INVENTORYchain is now unbroken:#880 → #879 → #876 → #875 → #862 → #856Each new entry is marked RECONSTRUCTED with its sources — PR body, merged diff stats, merge commit, and for #875/#876/#879 this session's direct authorship or full-diff review. Forensic method per the 2026-07-27 precedent: never inference.
Also appends a dated correction to #880's arc-gap note. "Queued, not done" held for about an hour before the operator ruled that the backfill belongs to the session still holding the context, rather than to a later forensic pass — which is the right call, and the reason the previous gap needed a dedicated recovery session.
What each entry preserves
MailboxFleetbridge it left open, as structurally impossible.cargo testnever runs an example'smain().The finding this backfill produced
Writing the three probe entries together surfaced something none shows alone, now recorded as
E-THE-DEFECTS-LIVE-IN-THE-FALSIFIERS-NOT-THE-MEASUREMENTS-1:A wrong measurement is loud — it contradicts something. A wrong falsifier is silent: it prints PASS and looks like validation. The entry carries the three concrete shapes (a permutation that isn't one, scoring +0.645 on cell identity alone; an 0.018-wide pass window whose original success was luck; a threshold that would have passed at 24.9 % while the prose claimed ≈1/17), the compounding case where fixing a mislabelled denominator reproduced the error one level up, and the CI corollary — until #862, an entire class of falsifier was decorative in CI.
Fenced honestly: this says the review-found defects clustered in falsifiers. It does not claim the measurements were correct, only that no round found a defect in one — an absence of evidence over three PRs, not proof.
Test plan
Board-file-only; no code, no behaviour. Append-only respected: new entries prepend, the one touch to an existing entry is a dated correction line (rule 4), no past entry rewritten.
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https://claude.ai/code/session_01K3RyLEbuNSHxxB3NTTrGki
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