feat(STATE-WP-0064): add consistency sweep remote-all API endpoint

Expose POST /consistency/sweep/remote-all so activity-core can trigger
the workstation ADR-001 remote-all sweep via the bridge tunnel pattern.
Records consistency_sweep_remote_all progress events and documents the
cutover runbook while the local custodian-sync timer remains interim.

api/routers/consistency_sweep.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+import json
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from api.database import get_session
+from api.schemas.consistency_sweep import (
+    ConsistencySweepRemoteAllGenerate,
+    ConsistencySweepRemoteAllRun,
+)
+from api.services.consistency_sweep import run_remote_all_sweep
+
+router = APIRouter(prefix="/consistency/sweep", tags=["consistency"])
+
+
+@router.post(
+    "/remote-all",
+    response_model=ConsistencySweepRemoteAllRun,
+    status_code=status.HTTP_201_CREATED,
+)
+async def sweep_remote_all(
+    body: ConsistencySweepRemoteAllGenerate,
+    session: AsyncSession = Depends(get_session),
+) -> ConsistencySweepRemoteAllRun:
+    try:
+        return await run_remote_all_sweep(session, max_seconds=body.max_seconds)
+    except json.JSONDecodeError as exc:
+        raise HTTPException(
+            status_code=500,
+            detail=f"Consistency sweep returned invalid JSON: {exc}",
+        ) from exc