board: give the D-DT64-6 predicates entry its own id (D-DT64-6-1a)

#1831's entry already owns D-DT64-6; entries_index --check rejects
the duplicate.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XAqKMPWTwovjYJEUMuGPb4

Author: claude

.claude/board/entries/2026-10-28-d-dt64-6-ogit-predicates-impl.md

@@ -1,4 +1,4 @@
-# D-DT64-6 predicates: implementation plan for the OGIT predicate expansion
+# D-DT64-6-1a to 6-4: implementation plan for the OGIT predicate expansion
 
 **Status:** PROPOSED / DOCS ONLY. Plan: [d-dt64-6-ogit-predicates-impl-v1.md](../../plans/d-dt64-6-ogit-predicates-impl-v1.md). Companion to [#1831](https://github.com/AdaWorldAPI/lance-graph/pull/1831) (D-DT64-6), which stages the OGIT work in one line per stage. No code, test, ABI or merge authorization.
 Read at lance-graph `main` `eeaaafb`, OGAR `main` `6b43a48`, AdaWorldAPI/OGIT `master` `b5731a8` (provenance receipt, not a pin).

.claude/board/entries/README.md

@@ -31,7 +31,7 @@ exactly one of them, never both.
 |---|---|---|---|
 | 2026-10-28 | `D-SAG-6-1` |  | [2026-10-28-d-sag-6-1-audit-reference-ledger.md](2026-10-28-d-sag-6-1-audit-reference-ledger.md) |
 | 2026-10-28 | `D-DT64-6` |  | [2026-10-28-d-dt64-6-routing-bindstore-behavior.md](2026-10-28-d-dt64-6-routing-bindstore-behavior.md) |
-| 2026-10-28 | `D-DT64-6` |  | [2026-10-28-d-dt64-6-ogit-predicates-impl.md](2026-10-28-d-dt64-6-ogit-predicates-impl.md) |
+| 2026-10-28 | `D-DT64-6-1a` |  | [2026-10-28-d-dt64-6-ogit-predicates-impl.md](2026-10-28-d-dt64-6-ogit-predicates-impl.md) |
 | 2026-10-27 | `harvest-integration-composite-key-and-simd-scope` |  | [2026-10-27-harvest-integration-composite-key-and-simd-scope.md](2026-10-27-harvest-integration-composite-key-and-simd-scope.md) |
 | 2026-10-26 | `D-ONNX-INTAKE-0` |  | [2026-10-26-onnx-frontend-intake-bakeoff.md](2026-10-26-onnx-frontend-intake-bakeoff.md) |
 | 2026-10-26 | `D-DT64-0` |  | [2026-10-26-dt64-holographic-interface.md](2026-10-26-dt64-holographic-interface.md) |