Fix delete-script FK error; trigger drift on scope change

- deleteScript: null out deployments.script_id/script_version_id/prior_version_id
  and deployment_scripts.prior_version_id inside a transaction before the
  cascade. These are historical audit FKs (NO ACTION), so the cascade from
  script_versions was blowing up any delete of a promoted script.
- Scope endpoint fires runDriftDeployment in the background after any scope
  mutation so orphan/missing files from the change get reconciled.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/routes/api/scripts/[id]/scope/+server.ts

@@ -1,12 +1,24 @@
 import { json } from '@sveltejs/kit';
 import { getScript, setScope, ScriptError, type ScopeType } from '$lib/server/fleet/scripts.js';
 import { unsetScopeAndCleanup } from '$lib/server/fleet/beta.js';
+import { runDriftDeployment } from '$lib/server/fleet/drift.js';
+import { kick } from '$lib/server/pipeline/worker.js';
 
 function parseId(raw: string): number | null {
     const n = Number.parseInt(raw, 10);
     return Number.isFinite(n) ? n : null;
 }
 
+// Fire-and-forget: after a scope mutation, reconcile any drift the change may
+// have introduced (orphan files on servers that no longer match, or missing
+// files on servers that now do). Runs in the background so the API returns
+// promptly; the deployment will surface on /deployments if there's real drift.
+function triggerDrift(): void {
+    void runDriftDeployment({ triggeredBy: 'ui' })
+        .then((result) => { if (result.deploymentId) void kick(); })
+        .catch(() => { /* surfaced on /deployments if it fails */ });
+}
+
 // POST body: { scopeType: 'game' | 'map' | null, scopeValue?: string }
 // Setting/changing scope on a script with a current_version_id returns a
 // 409 with kind='scope-requires-beta'; unsetting cleans the file off matching
@@ -28,9 +40,11 @@ export async function POST({ params, request }: { params: { id: string }; reques
     try {
         if (scopeType === null) {
             const cleaned = await unsetScopeAndCleanup(scriptId);
+            triggerDrift();
             return json({ ok: true, cleaned });
         }
         const updated = setScope({ scriptId, scopeType, scopeValue });
+        triggerDrift();
         return json({ ok: true, script: updated });
     } catch (err) {
         if (err instanceof ScriptError) {