step(n) docstring: raw-exchange ledger holds the final interval only

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/validation/refined_dfg_window.md

@@ -56,16 +56,3 @@ Root must independently review and admit any execution. An admitted paired pilot
 the existing watchdog, device selection, `--gpu-gates-approved`, positive
 `--max-wall-seconds` and a new output directory, adding only `--exchange-window` to the
 selected collision's pilot command. No GPU or remote action was performed for this patch.
-
-## Wide fine storage allocation
-
-The wide runner uses `FINE_BLOCK = (240, 568)`: one block containing the whole
-fine allocation, including the four-cell refinement ghost band on each side.
-The active `232 x 560` region alone is not a valid substitute. Physical bounds,
-resolution, numerical kernels, 256-thread launches, per-root synchronization
-and all scientific gates are unchanged. The plan records this storage block.
-
-This is a wide-only configuration backport; no compact-placement or public-Jet
-API is added. Existing source hashes remain checked, and the separate runner
-hash requires a fresh completed pilot before a full run. Earlier short-layout
-timings do not establish a full-run speedup or change historical failed verdicts.

tests/validation/run_refined_dfg.py

@@ -17,7 +17,7 @@ HERE = Path(__file__).resolve().parent
 DEFAULT_SOURCE = HERE.parents[1]
 BOUNDS = (40, 24, 320, 140)
 BASE_BLOCK = (2, 881)  # Exact 166 x 881 domain; no geometric padding.
-FINE_BLOCK = (240, 568)  # Whole fine allocation, including its refinement ghost band.
+FINE_BLOCK = (8, 8)  # 240 x 568 including four fine halo cells.
 SPEED = 0.01