Add safe manual instance rebalancing

src/lib/server/hosts/availability.ts

@@ -3,6 +3,7 @@ import { fleetSettings } from '../settings.js';
 import { subscribe } from '../pipeline/bus.js';
 import { capacityCalibration } from './calibration.js';
 import { HEARTBEAT_MAX_AGE_MS, listHosts } from './index.js';
+import { committedRebalanceStartup } from '../provisioning/concurrency.js';
 import type { CapacityCalibration, Host, NativePlacement } from '../../hosts.js';
 import type { LaunchAvailability } from '../../deployment-plan.js';
 
@@ -37,9 +38,9 @@ function snapshotSchemaReady(handle: ReturnType<typeof db>): boolean {
 
 function queueSnapshot(handle: ReturnType<typeof db>, hosts: Map<string, HostAvailability>): Snapshot {
     const counts = handle.prepare(`SELECT
-        COALESCE(SUM(state IN ('running','awaiting-health')),0) AS active,
+        COALESCE(SUM(state IN ('running','awaiting-health') OR ${committedRebalanceStartup}),0) AS active,
         COALESCE(SUM(state='queued'),0) AS queued FROM server_deployments
-        WHERE action IN ('create','rebuild') AND state IN ('queued','running','awaiting-health')
+        WHERE action IN ('create','rebuild') AND (state IN ('queued','running','awaiting-health') OR ${committedRebalanceStartup})
         AND server_deleted_at IS NULL`).get() as { active: number; queued: number };
     return { hosts, ...counts, startupLimit: fleetSettings().createConcurrency, updatedAt: new Date().toISOString() };
 }