Initial commit — SvelteKit fleet manager for T5 Plutonium servers

Ports push_scripts.sh (1497 lines of bash) to a SvelteKit + SQLite web app
that manages a fleet of T5 Plutonium servers running on Komodo. Same push
and beta workflow as the shell script, with a live SSE pipeline view, a
!rt-token-gated auth modal that hard-pauses deployments on stale tokens,
per-file audit diffs, and a Komodo-container deployment target.

- Push/beta engines port the exact filter, held-by-beta, conflict, and
  stale-backup rules from the shell script
- SQLite (better-sqlite3) replaces script_metadata.json; a one-shot
  importer moves legacy state over on first boot
- 16 vitest tests cover push add/update/skip, beta open→rollback,
  open→promote, conflict guards, sweep frozen/manual branches, and IW4M
  login/status parsing
- docker/ + komodo/stack.toml deploy as a managed container on the same
  host as the game servers, /root/zombies bind-mounted at the same path
  the shell script used

src/lib/server/pipeline/bus.ts

@@ -0,0 +1,39 @@
+import { EventEmitter } from 'node:events';
+
+// One in-process event bus, multiplexed by all three SSE endpoints. Kept
+// separate from any specific subscriber so push/beta/sweep can emit without
+// pulling the whole worker module in.
+
+export type PipelineEvent =
+    | { type: 'deployment-opened'; deploymentId: string; action: string; servers: string[] }
+    | { type: 'server-changed'; deploymentId: string; server: string; files: number }
+    | {
+          type: 'server-state';
+          deploymentId: string;
+          server: string;
+          state: 'pending' | 'done' | 'failed' | 'held' | 'manual';
+          players: number | null;
+          error: string | null;
+      }
+    | { type: 'sweep-tick'; frozen: boolean; reason?: string }
+    | { type: 'auth-state'; state: import('../integrations/auth-state.js').AuthState; msRemaining?: number }
+    | { type: 'server-status'; entries: Array<{ server: string; players: number | null; name?: string }> };
+
+class Bus extends EventEmitter {
+    constructor() {
+        super();
+        // Deployments and sweep can produce a lot of events during a big push.
+        this.setMaxListeners(64);
+    }
+}
+
+const bus = new Bus();
+
+export function emit(event: PipelineEvent): void {
+    bus.emit('event', event);
+}
+
+export function subscribe(listener: (event: PipelineEvent) => void): () => void {
+    bus.on('event', listener);
+    return () => bus.off('event', listener);
+}