.claude/CLAUDE.md: correct the stale ACL-RWT overhead figure

The June 2026 campaign's +0.0054%-0.0088% number was cited as current,
but it measured the wrong thing under the wrong name -- the
Rolling-Window-of-Truth mechanism it was named after was dead code,
never reachable, and the measurement itself predates real compiler
optimization. Kept the original entry for historical record, added a
correction pointing to the actual current figure: +0.0603% ACL-TTL
enforcement overhead (FABRIC-2.md SS T), the same closure just applied
to FABRIC-3.md's stale re-measurement punch-list item.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CXjAPTEKrgY2Mrk25KoLDn

.claude/CLAUDE.md

@@ -128,11 +128,20 @@ The word-level ACL system is fully implemented, including kernel parity. Key con
 8. ⬜ PKI / thumbdrive — Ed25519 challenge-response; user minting by zuse. **This is the open
    item — pick up here next.**
 
-**ACL-RWT DoE campaign (June 15–16 2026):**
+**ACL-RWT DoE campaign (June 15–16 2026) — superseded, kept for historical record:**
 - 3×3 Latin square: 3 seeds × amd64/aarch64/riscv64, 30 reps each
 - Measured overhead: +0.0054%–+0.0088% across all 9 cells; CV = 0.000%
 - Report confirmed to exist: `experiments/bare_metal/analysis/report/bare_metal_doe_report.pdf`
   (~2MB, with LaTeX source and figures) — patent support material
+- **Correction (found 2026-08-20/21, `FABRIC-2.md` §§M–T):** the "ACL-RWT" name itself was
+  wrong — the Rolling-Window-of-Truth mechanism it was named after was dead code, removed
+  2026-07-08 (`ACL-RECHECK-RW` was never reachable — `acl_recheck()` only ever looks up the
+  11-char `ACL-RECHECK`, never the 14-char `-RW` variant). What this campaign actually
+  measured was the live `ACL-TTL` mechanism under a misleading name, and at `-O0`, before
+  real compiler optimization landed. The corrected, current figure — same live mechanism,
+  correct name, re-run on the current substrate — is **+0.0603% ACL-TTL enforcement overhead,
+  architecture-independent, CV=0.000%** (`FABRIC-2.md` §T, memory
+  `project_acl_ttl_overhead_final.md`). Use that number, not the one above.
 
 **Before writing or modifying any `.4th` capsule file**, read `experiments/bare_metal/README.md`
 in full. The block namespace is shared across all loaded capsules; violations cause silent