STATE-WP-0093: per-recipient broadcast receipts and standing notices (T01-T06).

Founder approved T01 on 2026-09-22 (D2, D3, D6 as recommended).
- T02: message_receipts table; kind/expires_at/supersedes_id on
  agent_messages; migration d7e8f9a0b1c2 archives existing broadcasts,
  leaves direct messages untouched, reversible.
- T03: reader-aware mark-read (unattributed broadcast mark-read is a
  metered, deprecated no-op), delivery receipts on the scoped unread inbox,
  POST /messages/{id}/ack, news/standing kinds, expiry, supersede, broadcast
  archive no longer stamps read_at, reply writes the replier's receipt.
- T04 (state-hub part): Codex MCP reader param and acknowledge_notice;
  hub-core part handed off (message 69fc387c).
- T05: GET /messages/notices, standing_notices in /state/summary,
  dashboard standing-notices panel.
- T06: 17 new tests; full suite green.

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

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 63291@bnt-lap001
Assistant-Session: 8bd77868-ca68-4f49-bb1e-d539ecc0d703

tests/test_hub_core_imports.py

@@ -37,8 +37,12 @@ from hub_core.schemas.tpsc import (
 )
 
 
-def test_state_hub_reexports_core_message_schema() -> None:
-    assert MessageCreate is CoreMessageCreate
+def test_state_hub_message_schema_extends_core() -> None:
+    # STATE-WP-0093 extends the hub-core shape locally (kind, expires_at,
+    # supersedes_id) until hub-core absorbs the fields; then this returns to
+    # an identity re-export.
+    assert issubclass(MessageCreate, CoreMessageCreate)
+    assert set(CoreMessageCreate.model_fields) <= set(MessageCreate.model_fields)
 
 
 def test_state_hub_reexports_core_doi_schema() -> None: