docs(.claude/SMB): point at PR #365 W13 hydration spec as the formal companion

Sprint-5-6 W13 landed the formal OGIT TTL hydration spec at
.claude/specs/pr-ogit-ttl-smb-hydration.md (663 LOC, sourced from
smb-office-rs OGIT_TTL_INVENTORY.md). It's the executable handoff for
OGIT-side authoring + the lance-graph-side 0-LOC consumption proof.

This SCHEMA.md remains the quick-reference (two pages, lance-graph
session reader). The W13 spec is the deep-dive when the task is
actually authoring OGIT TTL or wiring registry hydration.

Header callout added so future lance-graph sessions discover both:
SCHEMA.md for quick context, pr-ogit-ttl-smb-hydration.md for execution.

Author: claude

.claude/SMB/SCHEMA.md

@@ -15,6 +15,11 @@
 >   build_smb_ontology()`
 > - Originating inventory: `smb-office-rs/.claude/board/OGIT_TTL_INVENTORY.md`
 >
+> **Formal hydration spec:** `lance-graph/.claude/specs/pr-ogit-ttl-smb-hydration.md`
+> (W13, sprint-5-6) — 35 KB executable spec, derived from the
+> originating inventory above. Read this when the task is OGIT-side
+> TTL authoring or registry hydration wiring.
+>
 > When the two diverge, smb-office-rs wins; update this doc.
 
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