docs: record domain hub-core import seam

docs/hub-core-extraction-boundary.md

@@ -88,6 +88,9 @@ Current implementation status:
 - 2026-06-07: T08 schema imports expanded. Hub-core's TPSC schema/report
   contract now matches State Hub, and State Hub re-exports `api.schemas.tpsc`
   from `hub_core.schemas.tpsc`.
+- 2026-06-07: T08 domain schema imports started. State Hub now imports base
+  domain schemas from `hub_core.schemas.domain` while keeping dev-hub-specific
+  domain detail and summary schemas local.
 
 ## Extract Now
 
@@ -195,8 +198,8 @@ to import it:
 
 ## Next Step
 
-Continue T08 by replacing the next lowest-risk generic schema/router imports,
-likely policy or non-mutating router seams. Do not import hub-core SQLAlchemy
-models into State Hub until the shared metadata/migration strategy is explicit.
-Do not rename State Hub to dev-hub until T05-T08 prove the shared package
-boundary.
+Continue T08 by replacing the next lowest-risk generic schema imports. Router
+imports should wait until the model metadata/migration strategy is explicit,
+or use host-model injection rather than importing hub-core SQLAlchemy models
+directly into State Hub. Do not rename State Hub to dev-hub until T05-T08 prove
+the shared package boundary.

workplans/CUST-WP-0025-fos-hub-bootstrap.md

@@ -272,6 +272,12 @@ State Hub import/core-router/recently-on-scope focused tests passed. A full
 State Hub run reached 349 passed / 1 failed; the lone recently-on-scope failure
 passed when rerun alone and with the new import seam tests.
 
+Implementation slice 3 (2026-06-07): converted State Hub's base domain schemas
+(`DomainCreate`, `DomainRead`, `DomainRename`, `DomainUpdate`) into imports
+from `hub_core.schemas.domain` while keeping dev-hub-specific `DomainDetail`
+and `DomainSummary` local. Verification: State Hub import/core-router focused
+tests passed with 58 tests.
+
 ### T09 — Rename MCP server state-hub to dev-hub
 
 ```task