Retire completed GTL tuning harnesses

reports/README.md

@@ -61,32 +61,30 @@ after scanner integration passed: the regenerated report changed only its
 `generated_at` timestamp, confirming that the shared helper preserves exact
 parity. Nothing in this research branch deploys the change to production.
 
-The next decision point is generated by the one-command GTL parameter run:
+The archived single-parameter decision point is:
 
-- `backtest-YYYYMMDD-gtl-tuning-matrix.json`
-- `backtest-YYYYMMDD-gtl-tuning-matrix.md`
+- `backtest-20260713-gtl-tuning-matrix.json`
+- `backtest-20260713-gtl-tuning-matrix.md`
 
-These two consolidated files are the reports worth retaining. The runner uses
-a hidden temporary directory for its 20 full per-arm reports and removes it
-after successful consolidation unless `--keep-arm-reports` is supplied.
+These two compact consolidated files are retained; the 20 full per-arm reports
+were removed after consolidation.
 
 The completed 2026-07-13 matrix found no single-parameter replacement that
 passed all robustness checks. Retain its JSON and Markdown as that decision
-point. The evidence-selected retained-versus-added decomposition writes:
+point. The retained-versus-added decomposition is retained as:
 
-- `backtest-YYYYMMDD-gtl-confirmation-matrix.json`
-- `backtest-YYYYMMDD-gtl-confirmation-matrix.md`
+- `backtest-20260713-gtl-confirmation-matrix.json`
+- `backtest-20260713-gtl-confirmation-matrix.md`
 
-Those become the next decision point; detailed per-arm reports remain temporary
-unless explicitly retained.
+Detailed per-arm reports were not retained.
 
 The completed confirmation matrix found one near-hit but no formal winner:
 strength-1000 intersection improved full/train/post-2024 Sharpe and CAGR, while
 max drawdown worsened from 21.4% to 21.7%. Retain that matrix as the cohort-
-decomposition decision point. The final stability check writes:
+decomposition decision point. The final stability check is retained as:
 
-- `backtest-YYYYMMDD-gtl-strength-sensitivity.json`
-- `backtest-YYYYMMDD-gtl-strength-sensitivity.md`
+- `backtest-20260713-gtl-strength-sensitivity.json`
+- `backtest-20260713-gtl-strength-sensitivity.md`
 
 Its pre-registered decision requires at least two adjacent scales to pass all
 six unchanged checks.
@@ -96,3 +94,6 @@ 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.
+
+The temporary matrix runners and their configurable backtest hooks were removed
+after consolidation. The normal local snapshot backtester remains.