docs(changelog): record T-11 — a default address on each consumer grant

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- **A default address on each consumer grant** (`tenant_consumers.default_address`,
+  migration 008, core-api T-11) — the Office's fallback when a call names no
+  address and holds no session binding, since claude.ai's connector keeps no
+  MCP session between tool calls. A composite foreign key
+  `(tenant_id, default_address)` -> `scribe_addresses(owner_tenant, name)`
+  ensures a default always names a real address in the same tenant.
+  `jpmschweitzer`/`office-claude` defaults to `claude-ai` where that address
+  already exists; every other grant stays null. `GET /tenants/me` answers it
+  for the caller's own consumer grant, or null for a user-kind caller or a
+  grant without one; `GET /tenants` is unchanged. No write route this round —
+  provisioning is later.
+
 ## [1.12.0] - 2026-10-19
 
 ### Added