CodeGateSoftware · eaitbrahim · Sep 2, 2026 · Sep 2, 2026
diff --git a/docs/experiments/2026-07-20-adx-ablation-and-random-entry-control.md b/docs/experiments/2026-07-20-adx-ablation-and-random-entry-control.md
@@ -1,5 +1,13 @@
 # ADX Ablation + Random-Entry Control Arm — 2026-07-20
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Status:** in-sample measurement on full cached history. **NOT out-of-sample. NOT a promotion decision.**
 
 Motivated by two findings in KB `source-58` (Katz & McCormick, *The Encyclopedia of Trading Strategies*):

diff --git a/docs/experiments/2026-07-20-exit-lookback-ratio.md b/docs/experiments/2026-07-20-exit-lookback-ratio.md
@@ -1,5 +1,13 @@
 # `exit_lookback` ratio test — §79.6's monotone prediction does NOT replicate
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-07-20
 **Status:** in-sample sensitivity characterisation on cached daily history. **Not a promotion decision.**
 **Ledger session:** `exit-lookback-2026-07-20` (5 diagnostic columns + 1 decision row)

diff --git a/docs/experiments/2026-08-08-between-family-independence.md b/docs/experiments/2026-08-08-between-family-independence.md
@@ -1,5 +1,13 @@
 # Between-family independence — the §80.16 harness exists, and it is calibrated
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-08-08
 **KB basis:** §80.16 (the measurement), §73.5 (why it is non-optional), §74.3/§58.10a (why arm B
 is refuted), §80.10/§80.14 (who the real candidate is)

diff --git a/docs/experiments/2026-08-11-hourly-backtest-turtle-breakout.md b/docs/experiments/2026-08-11-hourly-backtest-turtle-breakout.md
@@ -1,5 +1,13 @@
 # `turtle_breakout` clears `min_trades=100` on hourly bars — and loses on all 19 of them
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-08-11
 **Issue:** none — nobody asked for this. It fell out of the 2026-08-11 scout run
 (`~/keel/proposals/2026-08-11-shortlist.json`), which carried DOGE forward on a daily

diff --git a/docs/experiments/2026-08-11-hourly-param-sweep-turtle-breakout.md b/docs/experiments/2026-08-11-hourly-param-sweep-turtle-breakout.md
@@ -1,5 +1,13 @@
 # Re-tuning `turtle_breakout` to the hourly clock buys 51% and still loses on everything — 0 of 144 parameter sets
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-08-11
 **Issue:** none. This is the experiment `docs/experiments/2026-08-11-hourly-backtest-turtle-breakout.md`
 §9.4 recommended someone file, run on the same day instead of filed. That document identified its

diff --git a/docs/experiments/2026-08-12-fee-curve-and-rsi-meanrev.md b/docs/experiments/2026-08-12-fee-curve-and-rsi-meanrev.md
@@ -1,5 +1,13 @@
 # At zero fee `turtle_breakout` makes money and `rsi_meanrev` does not — two failure modes that were one inference away from being pooled
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-08-12
 **Issue:** none. Two threads meet here. One is
 `docs/experiments/2026-08-11-hourly-param-sweep-turtle-breakout.md` §10.3(b) — *the execution-cost

diff --git a/docs/experiments/2026-08-12-rsi-meanrev-scale-vs-selectivity.md b/docs/experiments/2026-08-12-rsi-meanrev-scale-vs-selectivity.md
@@ -1,5 +1,13 @@
 # `rsi_meanrev`'s edge is selectivity, not alpha — and the search for it found a simulator defect
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 > **⚠️ AMENDED 2026-08-13 — read alongside
 > [`2026-08-13-restated-under-a-production-faithful-engine.md`](2026-08-13-restated-under-a-production-faithful-engine.md).**
 >

diff --git a/docs/experiments/2026-08-12-shipped-defaults-intersection.md b/docs/experiments/2026-08-12-shipped-defaults-intersection.md
@@ -1,5 +1,13 @@
 # Three rules, 24 assets, zero free parameters — the viable intersection is empty, and one of the three fails for the opposite reason we recorded
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 > **⚠️ AMENDED 2026-08-13 — read alongside
 > [`2026-08-13-restated-under-a-production-faithful-engine.md`](2026-08-13-restated-under-a-production-faithful-engine.md).**
 >

diff --git a/docs/experiments/2026-08-13-restated-under-a-production-faithful-engine.md b/docs/experiments/2026-08-13-restated-under-a-production-faithful-engine.md
@@ -1,5 +1,13 @@
 # Two engine defects, both invisible to 2,712 passing tests — and what the conclusions become without them
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-08-13
 **Amends:** `2026-08-12-shipped-defaults-intersection.md` (#252) and
 `2026-08-12-rsi-meanrev-scale-vs-selectivity.md` (#255)

diff --git a/docs/experiments/2026-08-17-honest-cost-restatement-and-dca-ablation.md b/docs/experiments/2026-08-17-honest-cost-restatement-and-dca-ablation.md
@@ -1,5 +1,13 @@
 # 2026-08-17: The honest-cost simulate re-run, and the DCA dip-bonus ablation
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 Two measurements, one date, both enabled by Phase 9: the first `keel simulate` run under
 per-product slippage (#334, v0.9.0), and the first-ever measurement of the DCA family in a
 fee-explicit harness. Recorded together because they answer the two questions Phase 10's

diff --git a/docs/experiments/2026-08-22-trailing-vs-static-exits.md b/docs/experiments/2026-08-22-trailing-vs-static-exits.md
@@ -1,5 +1,13 @@
 # Trailing vs static exits: does the ratchet-only exit policy help, at the fee actually paid?
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Issue #442.** Driver: [`2026-08-22-trailing-vs-static-exits.py`](2026-08-22-trailing-vs-static-exits.py)
 (pre-registered in its docstring before the run). Artifact: every number below is a row of
 [`2026-08-22-trailing-vs-static-exits.jsonl`](2026-08-22-trailing-vs-static-exits.jsonl) — 240

diff --git a/docs/experiments/2026-08-27-external-strategy-evaluation-hazard.md b/docs/experiments/2026-08-27-external-strategy-evaluation-hazard.md
@@ -1,5 +1,13 @@
 # The fill-model hazard in externally-sourced strategies: what to establish before a foreign number means anything here
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-08-27 · **Issue:** #529 · **Origin:**
 [`docs/superpowers/specs/2026-08-23-strategy-api-expressiveness-prd.md`](../superpowers/specs/2026-08-23-strategy-api-expressiveness-prd.md)
 §4.2 ("a warning worth encoding, not a feature").

diff --git a/docs/experiments/2026-08-30-slippage-cap-options.md b/docs/experiments/2026-08-30-slippage-cap-options.md
@@ -1,5 +1,13 @@
 # The 50 bp slippage cap: all three of #523's options, measured on one cohort by one method
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Issue #523.** Driver: [`2026-08-30-slippage-cap-options.py`](2026-08-30-slippage-cap-options.py)
 (pre-registered in its docstring before the run). Artifact: every number below is a row of
 [`2026-08-30-slippage-cap-options.jsonl`](2026-08-30-slippage-cap-options.jsonl) — 210 cells

diff --git a/docs/experiments/2026-09-01-cusum-event-first-measurement.md b/docs/experiments/2026-09-01-cusum-event-first-measurement.md
@@ -1,5 +1,13 @@
 # CUSUM event gating, first measurement — feasible, and without a gross edge
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-09-01 · **Issue:** [#341](https://github.com/CodeGateSoftware/keel/issues/341) ·
 **Rule:** `cusum_event` · **Driver:** `2026-09-01-cusum-event-first-measurement.py` ·
 **Ledger row:** `cusum-event-first-measurement-2026-09-01` (168 trials disclosed)

diff --git a/docs/experiments/2026-09-01-triple-barrier-first-measurement.md b/docs/experiments/2026-09-01-triple-barrier-first-measurement.md
@@ -1,5 +1,13 @@
 # Triple-barrier exits: a real gross improvement, worth exactly nothing after friction
 
+> **Cost note (added 2026-09-02).** The figures below are priced at the flat 5bp
+> slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md) later measured that **no
+> asset in keel's universe reaches that floor** — the range is 1.1× to 36.8× — so every
+> profit factor here is optimistic by roughly 0.09 at the median. **The verdict is
+> unaffected:** the correction only ever moves a number *down*, and every result here was
+> already negative. Nothing on this page has been rewritten; records are appended to, not
+> revised.
+
 **Date:** 2026-09-01 · **Issue:** [#342](https://github.com/CodeGateSoftware/keel/issues/342) ·
 **Rule:** `triple_barrier` · **Control:** `cusum_event`
 ([measured the same day](2026-09-01-cusum-event-first-measurement.md)) ·

diff --git a/docs/experiments/README.md b/docs/experiments/README.md
@@ -1,5 +1,12 @@
 # Experiment records — index
 
+> **Cost note (added 2026-09-02).** Every record here dated before 2026-09-01 prices fills
+> at the flat 5bp slippage floor. [the per-product restatement](2026-09-01-per-product-slippage-restatement.md)
+> measured that **no asset in keel's universe reaches that floor** — 1.1× to 36.8× — so
+> those profit factors are optimistic by roughly 0.09 at the median. **No verdict in this
+> directory changes:** the correction only ever moves a number *down*, and they were
+> already null. Records are appended to, never revised.
+
 This directory is keel's experiment log: **pre-registered, reproducible records** of
 measurements, feasibility studies, and engine-defect findings. Every document states its own
 scope and status up front (in-sample vs out-of-sample, "not a promotion decision", "amends

diff --git a/tests/test_experiment_cost_pointers.py b/tests/test_experiment_cost_pointers.py
@@ -0,0 +1,80 @@
+"""An experiment record priced at the flat slippage floor must say where the correction is.
+
+`2026-09-01-per-product-slippage-restatement.md` measured what that floor costs: the model
+reaches it only at a $500M/day anchor and **no asset in keel's universe reaches it**, so every
+figure produced under it overstates the profit factor — by a median of 0.090 across 120 cells.
+
+That does not change any document's VERDICT. The correction is conservative-only: real cost is
+higher, so a corrected profit factor can only fall, and every one of the 120 deltas was negative
+or zero. Re-running thirteen documents to move numbers that were already null would be spending
+compute to reach the same conclusion.
+
+What it does change is what a reader may conclude by comparing ACROSS documents. A profit factor
+of 0.9 in one and 1.06 in another are not on the same scale if both were priced at a rate neither
+asset trades at, and a reader has no way to know that from the page. So each such record carries
+one line saying so.
+
+**Records are never rewritten** — `docs/experiments` is an append-only account of what was run,
+and editing a measured number would falsify it. A pointer is an addition, not a revision.
+"""
+
+from __future__ import annotations
+
+import re
+from pathlib import Path
+
+_ROOT = Path(__file__).resolve().parent.parent
+_EXPERIMENTS = _ROOT / "docs/experiments"
+
+#: The correction every flat-priced record must point at.
+RESTATEMENT = "2026-09-01-per-product-slippage-restatement.md"
+
+#: Records that report a profit factor AND state a slippage assumption are in scope. A document
+#: that reports neither has nothing to qualify.
+_REPORTS_PF = re.compile(r"profit factor|\bPF\b", re.I)
+_STATES_SLIPPAGE = re.compile(r"slippage", re.I)
+
+
+def flat_priced_records() -> list[Path]:
+    """Every record whose figures rest on a slippage assumption, excluding the correction."""
+    return [
+        path
+        for path in sorted(_EXPERIMENTS.glob("*.md"))
+        if path.name != RESTATEMENT
+        and _REPORTS_PF.search(text := path.read_text(encoding="utf-8"))
+        and _STATES_SLIPPAGE.search(text)
+    ]
+
+
+def test_there_are_records_in_scope() -> None:
+    """A guard on the guard: if the discovery ever matches nothing, every assertion below
+    passes vacuously and this file stops meaning anything."""
+    assert len(flat_priced_records()) >= 10
+
+
+def test_every_flat_priced_record_points_at_the_correction() -> None:
+    """The pin. A reader comparing profit factors across records has no way to know from the
+    page that both were priced at a rate neither asset trades at."""
+    missing = [
+        path.name
+        for path in flat_priced_records()
+        if RESTATEMENT not in path.read_text(encoding="utf-8")
+    ]
+    assert not missing, (
+        f"{len(missing)} experiment record(s) report a profit factor under a slippage "
+        f"assumption without pointing at {RESTATEMENT}:\n  " + "\n  ".join(missing)
+    )
+
+
+def test_the_pointer_says_the_verdict_is_unchanged() -> None:
+    """A bare link would read as "this result is wrong". It is not — the correction is
+    conservative-only and every verdict here survives it. A pointer that let a reader conclude
+    otherwise would be a worse error than the one it corrects.
+    """
+    for path in flat_priced_records():
+        text = path.read_text(encoding="utf-8")
+        window = text[max(0, text.find(RESTATEMENT) - 600) : text.find(RESTATEMENT) + 600]
+        assert "verdict" in window.lower(), (
+            f"{path.name}: the pointer does not say the verdict is unaffected, so it reads as "
+            "a retraction of a result that still stands"
+        )