diff --git a/.claude/board/LATEST_STATE.md b/.claude/board/LATEST_STATE.md
index 005ef2a7..75c5510e 100644
--- a/.claude/board/LATEST_STATE.md
+++ b/.claude/board/LATEST_STATE.md
@@ -855,6 +855,7 @@ Membrane consumers can now pull BOTH halves of a render `classid` BBB-safely fro
 | PR | Merged | Title | What it added |
 |---|---|---|---|
 | *gap note* | — | **#781–#925 are NOT in this table** — carried by the dated sections above + `PR_ARC_INVENTORY.md`. Recorded 2026-08-12 (codex P2 on #930) rather than silently reconstructed; the table had stalled at #780. | — |
+| **#942** | 2026-08-12 | "mean" qualifier fix + `substrate-comfort-zones-v1` (calibration × regime, made falsifiable) | MIXED. Plan states the operator's hypothesis as an INTERACTION (a poorly-calibrated adaptive substrate does relatively better in strong/turbulent storms than in calm regimes) across **4** held-constant regimes × formula × calibration quality — the preflight SPLIT "flatland" into calm and active tiers: R1 CALM Amazon (`\|∇p\|` 10.2) → R2 OCEAN S-Pacific (14.9) → R3 ACTIVE W-Siberia (43.8) → R4 STORM (95.6), a 9.3× range. "Worse everywhere but least-worse in storms" ≠ "better only in storms", and the plan distinguishes them. D-CZ-0 preflight DONE (sample-composition arithmetic run before the first fetch — it is what forced the 4-way split; units annotated at coefficient definition). **D-CZ-1, the control-losability smoke test, is PRESCRIBED BY the plan but Queued — not yet run**, and gates every later cell. D-CZ-2..6 Queued. Also fixed CodeRabbit's Minor on #941 — #940's 25 %/9 % figures are MEANS over 19 storms, qualifier restored (4th instance this week of scope-lost-in-summary). |
 | **#940** | 2026-08-12 | W6 lands — vector-sum dipole model VOID by its own anti-vacuity control; stranded stratum empty by CT-F14's filter arithmetic; same-PR sign/units correction round | B0 VOID: single-geo R²=−0.104 (worse than the mean); both controls (permuted P_bow, P_bow rotated 90°) clear the `≤single-geo+0.03` ceiling. B3 stranded (`\|v_storm\|<8 m/s`): n=0 — `displacement_km≥250`/6h implies `\|v_storm\|≥11.57 m/s` for every admitted storm, `E-THE-DISPLACEMENT-FILTER-ATE-THE-STRANDED-STRATUM-1`. Same-PR: codex+CodeRabbit caught a sign-convention bug (`D=-spine(...)`, matching `low_pole_bearing()`'s own flip; verified offline that this leaves R²/B0/B1/B3 unchanged, confirmed on the actual re-run) and a units error (`c_bow` is km⁻¹ not dimensionless; replaced with the dimensionally valid `\|c_bow·P_bow\|` vs `\|D\|` metric — mean-over-19-storms: geo≈25%, bow≈9% of mean `\|D\|`). CT-F17's gate now moot for this model form. |
 | **#938** | 2026-08-12 | W5 v2 RUN lands — B2 REVERSES to genuine FAIL, B3's VOID CONFIRMED at full headline scale, both link families now verified | B2: real diffusion resolved (raw rel-L2 vs unsmoothed input = 0.190), operator's own anisotropy = **1.5251 vs the 1.25 bar** (baseline through the clean 3.35σ mask = 1.0046 — the operator alone contributes ~0.52). `domino.rs` gather-design claim REFUTED at this test point. B3: 99.68 % (family A) / 99.56 % (family B) of the QUALIFYING population's control links land on a pure Fibonacci offset (n_qualifying=4 782 017, out of the headline lattice N=7 651 227 — not a 62k sub-sample) — dominated by the two discovered strides 2584=F(18) / 4181=F(19) respectively. Same-PR fixes for 3 more codex findings: family-B histogram was previously uncomputed (now measured + JSON patched); "four orders of magnitude" corrected to ~1.9 (76.9×); B4 downgraded from verdict to explicit descriptive reading (n=19 was dropped without pre-authorization — B4 stays open). |
 | **#936** | 2026-08-12 | W5 v1 RUN (B2 PASS / B3 VOID / B4 smooth) — ⊘ SUPERSEDED same day, all three verdicts compromised; v2 CODE fix merged in this PR, v2 RUN/results in flight | Codex found 4 real defects: B3 control subsampled at 250k/band (~74 % self-linked at headline, ratio 0.9996 uninformative); B2's fit floor = input σ (8 iters ≈ inert, "resolved" indistinguishable from "untouched"); bump only 1.72σ from the mask edge (analytic truncation ratio 1.2082 ≈ the measured "1.213 asymptote" — likely the MASK, not the operator); 99.38 % Fibonacci-membership figure was chat-only. Fixed same day, code merged HERE (`106ca605`, verified an ancestor of this PR's merge commit — corrects two overclaims caught by codex P2 on PR #937: the fix was described as "landing in a follow-up PR" when it had already landed, and the histogram artifact as "committed" when only the SCRIPT that produces it had landed — the tracked JSON is still v1's until the v2 run completes): full-band control, V-matched iteration scaling, bump moved to 3.35σ clearance + baseline-through-mask computed, offset histogram now computed by the script. The epiphany's MECHANISM survives (sub-cap 99.38 % measurement was never subsampled) but its "does not exist" phrasing was also softened (codex P2 on #937: 99.38 % ≠ 100 %, one N/one construction ≠ universal proof) — only the headline evidentiary number is retracted; the claim is restated at its actual evidentiary scope, not deleted. |
diff --git a/.claude/board/PR_ARC_INVENTORY.md b/.claude/board/PR_ARC_INVENTORY.md
index 9feaf873..19d265f0 100644
--- a/.claude/board/PR_ARC_INVENTORY.md
+++ b/.claude/board/PR_ARC_INVENTORY.md
@@ -1,3 +1,55 @@
+## 2026-08-12 — lance-graph #942 (MERGED) — the "mean" qualifier fix + `substrate-comfort-zones-v1` (the operator's calibration-vs-regime hypothesis, made falsifiable)
+
+- **Added.** `.claude/plans/substrate-comfort-zones-v1.md` — the operator's
+  hypothesis stated as a testable interaction: *a poorly-calibrated
+  substrate that adapts dynamically should do RELATIVELY better in strong,
+  turbulent storms than in calm regimes.* **FOUR** held-constant regimes
+  × substrate formula × calibration quality — the preflight deliberately
+  SPLIT the operator's "flatland" into a calm and an active tier, so the
+  adopted ladder is **R1 CALM (Amazon basin, `|∇p|` 10.2) → R2 OCEAN
+  (S Pacific gyre, 14.9) → R3 ACTIVE (W Siberian lowland, 43.8) → R4
+  STORM (CT-F14 centres, 95.6)**, a 9.3× dynamic range. The claim is an
+  **interaction term**, not a main effect — "worse everywhere but
+  least-worse in storms" and "better only in storms" are different
+  findings and the plan distinguishes them. D-CZ-0 (preflight) ran and is
+  **DONE**; D-CZ-1..6 Queued.
+- **Locked — D-CZ-0's preflight corrections, found before any run; and
+  what it PRESCRIBED for the runs that have not happened yet.** Applying
+  this session's own hard-won rules to the new plan rather than
+  re-learning them. **Already executed in D-CZ-0:** the
+  sample-composition check (the
+  `E-THE-DISPLACEMENT-FILTER-ATE-THE-STRANDED-STRATUM-1` lesson) — the
+  regime ladder was verified arithmetically reachable in the source data
+  BEFORE the first fetch, and it is what forced the calm/active split;
+  plus the units discipline (every coefficient annotated at definition,
+  magnitude claims restricted to dimensionally consistent contributions —
+  the #940 `c_bow`-is-km⁻¹ lesson). **Prescribed but NOT yet run:**
+  **D-CZ-1 is the control-losability smoke test and is Queued** — the
+  W2s-a degenerate-grid and W5 locality-is-Fibonacci lessons are written
+  into the plan as a mandatory prerequisite gating every later cell, not
+  as work already done. A future session must run D-CZ-1 before any
+  expensive arm; the requirement existing in the plan is not the
+  requirement being satisfied.
+- **Fixed — CodeRabbit Minor on #941**: #940's summary rows dropped the
+  **mean** qualifier the source RUN entry and the committed JSON's
+  `fitted_contribution_Pa_per_km` keys carry (means over 19 storms).
+  PR_ARC's merged entry got an appended dated correction (append-only);
+  LATEST_STATE's living row was fixed in place (precedent: #939's
+  N-vs-n_qualifying fix). **Fourth instance this week of one defect
+  class** — a qualifier or operand pairing true in the source, lost in
+  the summary; the figure is never wrong, its scope goes unstated.
+- **Deferred.** Every D-CZ probe (operator go-ahead pending). The report
+  §10 reconciliation sweep (§10.2's model is disconfirmed, §10.5's
+  "gather-design unblocked" is retracted, §10.6's roadmap still shows the
+  pre-wave gates — the corrections live in plan RUN sections and
+  epiphanies, and the report itself has not yet been brought current).
+- **Confidence.** High on the qualifier fix (verified against the
+  committed JSON's own keys). The plan is a SPECIFICATION — nothing in
+  it has run beyond D-CZ-0's preflight checks.
+
+**Status:** MERGED (`61a60618`). Branch `claude/jirak-math-theorems-harvest-rfii13`
+→ `main`. Plan + board — zero product code, zero probe runs.
+
 ## 2026-08-12 — lance-graph #940 (MERGED) — W6 lands: VOID by its own control, sample-composition lesson, and a same-PR sign/units correction round
 
 - **Added.** `comet_tail_w6.py`/`.json` — full detail already recorded in