feat(node): pair onboard computers with the Core fleet through UI

src/k1link/web/app.py

@@ -112,6 +112,7 @@ from k1link.simulation.projects import SimulationProjectService, SimulationProje
 from k1link.web.advanced_laboratory_api import build_advanced_laboratory_router
 from k1link.web.artifact_health_api import build_artifact_health_router
 from k1link.web.compute_contour_api import build_compute_contour_router
+from k1link.web.fleet_api import router as fleet_router
 from k1link.web.device_plugin_composition import load_installed_device_plugins
 from k1link.web.e30_engineering_api import build_e30_engineering_router
 from k1link.web.e30_human_review_api import build_e30_human_review_router
@@ -897,7 +898,24 @@ async def _recorded_blueprint_resource_reaper() -> None:
 
 
 @asynccontextmanager
-async def app_lifespan(_: FastAPI) -> AsyncIterator[None]:
+async def app_lifespan(application: FastAPI) -> AsyncIterator[None]:
+    import logging
+    import sqlite3
+
+    from k1link.fleet.registry import FleetRegistry
+
+    fleet = None
+    application.state.fleet = None
+    try:
+        fleet = FleetRegistry(session_store.data_dir / "fleet")
+        fleet.start()
+        application.state.fleet = fleet
+    except (OSError, ValueError, sqlite3.Error):
+        # Fail closed for pairing without taking down unrelated operator work.
+        if fleet is not None:
+            fleet.close()
+            fleet = None
+        logging.getLogger(__name__).error("Fleet trust storage unavailable; pairing disabled")
     reconciler: asyncio.Task[None] | None = None
     publication_reconciler: asyncio.Task[None] | None = None
     blueprint_reaper: asyncio.Task[None] | None = None
@@ -920,6 +938,9 @@ async def app_lifespan(_: FastAPI) -> AsyncIterator[None]:
     finally:
         from k1link.viewer.recorded import recorded_blueprint_sessions
 
+        application.state.fleet = None
+        if fleet is not None:
+            await asyncio.to_thread(fleet.close)
         if blueprint_reaper is not None:
             blueprint_reaper.cancel()
             with suppress(asyncio.CancelledError):
@@ -950,6 +971,9 @@ app = FastAPI(
 app.add_middleware(GZipMiddleware, minimum_size=1_024, compresslevel=5)
 
 
+app.include_router(fleet_router)
+
+
 @app.exception_handler(RequestValidationError)
 async def request_validation_error_handler(
     _: Request,