Document final GTL research decision

README.md

@@ -513,6 +513,12 @@ It checks eight coarse scales around 1000, verifies exact control and
 strength-1000 replication, and requires two adjacent scales to pass every
 original guardrail before calling the result stable.
 
+Final result: control and strength-1000 replication both passed, but there was
+no adjacent passing plateau. Scale 1500 passed in isolation while lowering CAGR
+and setup expectancy; its neighbors failed. The research decision is therefore
+to keep the frozen GTL unchanged and evaluate any future challenger only on new
+forward data. See the [full research record](docs/research/sr-levels-and-exits.md#gtl-tuning-matrix).
+
 ### Reading a local backtest report
 
 The deployed **Signals → Track Record** page is deliberately trimmed to validation

docs/research/sr-levels-and-exits.md

@@ -906,6 +906,28 @@ is rejected as sensitivity.
   backtest_snapshots/prod.sqlite --workers 12
 ```
 
+Final result: **9/9 arms completed, control parity passed, and the
+strength-1000 replication passed.** Scale 1500 was the only arm to clear all
+six original checks, but neither adjacent scale (1250 or 2000) cleared them, so
+the pre-registered stable-plateau requirement failed. It also traded away
+return and setup quality despite its screen pass: CAGR fell from 50.0% to 48.8%
+and qualified expectancy from +0.209R to +0.188R.
+
+The sensitivity curve shows a real but non-dominating trade-off. Scales
+750–1000 produce small Sharpe improvements in parts of the sample but each
+misses a different unchanged guardrail; higher scales eventually reduce
+drawdown by filtering more setups, while CAGR, expectancy, and then Sharpe
+decline. There is no robust parameter neighborhood that improves the whole
+book.
+
+**Final decision: keep the frozen Gate Target Ladder and do not deploy a
+strength-confirmation gate.** The GTL remains the explicit, volume-free
+compatibility component that exactly reproduces the validated production
+screen. Clean Structural S/R remains the separate human-facing chart/alert
+model. This snapshot is now exhausted for GTL fitting; any future challenger
+must be pre-registered and evaluated on genuinely new forward data rather than
+another iteration over the same history.
+
 The post-2024 window has been opened and is now analysis data, not a valid final
 promotion holdout. These arms can isolate mechanism, but neither may ship without
 new future data or a separately pre-registered walk-forward protocol.

reports/README.md

@@ -90,3 +90,9 @@ decomposition decision point. The final stability check writes:
 
 Its pre-registered decision requires at least two adjacent scales to pass all
 six unchanged checks.
+
+Final sensitivity result: exact control and strength-1000 replication passed.
+Scale 1500 was the sole 6/6 arm, but no adjacent scale passed, so the stable-
+plateau rule rejected it. Retain the consolidated JSON/Markdown as the closing
+GTL decision point. No confirmation or tuned strength value should be promoted
+from this snapshot.