[Init] Initial commit - NetMesh terminal manager

application/state/shellHistoryStore.ts

@@ -0,0 +1,43 @@
+import type { ShellHistoryEntry } from '../../domain/models';
+
+type Listener = () => void;
+
+/**
+ * External store for shell history so History side-panel / snippets consumers
+ * can subscribe without forcing TerminalLayer re-renders on every command.
+ */
+class ShellHistoryStore {
+  private snapshot: readonly ShellHistoryEntry[] = [];
+  private listeners = new Set<Listener>();
+
+  getSnapshot = (): readonly ShellHistoryEntry[] => this.snapshot;
+
+  subscribe = (listener: Listener): (() => void) => {
+    this.listeners.add(listener);
+    return () => {
+      this.listeners.delete(listener);
+    };
+  };
+
+  setSnapshot(next: readonly ShellHistoryEntry[]): void {
+    if (this.snapshot === next) return;
+    this.snapshot = next;
+    for (const listener of this.listeners) {
+      listener();
+    }
+  }
+}
+
+export const shellHistoryStore = new ShellHistoryStore();
+
+export function publishShellHistorySnapshot(entries: readonly ShellHistoryEntry[]): void {
+  shellHistoryStore.setSnapshot(entries);
+}
+
+export function getShellHistorySnapshot(): readonly ShellHistoryEntry[] {
+  return shellHistoryStore.getSnapshot();
+}
+
+export function subscribeShellHistory(listener: Listener): () => void {
+  return shellHistoryStore.subscribe(listener);
+}