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

api/schemas/state.py

@@ -10,6 +10,7 @@ from api.schemas.progress_event import ProgressEventRead
 from api.schemas.task import TaskRead
 from api.schemas.topic import TopicWithWorkstreams
 from api.schemas.suggestion import RankedSuggestionDigest
+from api.schemas.agent_message import StandingNoticeDigest
 from api.schemas.workstream import WorkstreamWithDeps
 from api.schemas.ops_run import OpsRunProjection
 
@@ -94,6 +95,7 @@ class StateSummary(BaseModel):
     open_capability_requests: int = 0
     ranked_suggestions: list[RankedSuggestionDigest] = []
     ops_runs: OpsRunProjection | None = None
+    standing_notices: list[StandingNoticeDigest] = []
 
 
 class DashboardWorkplanRow(BaseModel):