feat: Mongo-backed Pods with full CRUD + member management

Pods are persisted in MongoDB and CRUD'd via /api/pods (list/create/get/
update/delete + add/remove member). Shared Pod reshaped to a persisted entity
(members: string[], description, timestamps) + PodInput. Backend seeds Demo/
Frontend/Backend Pods on first run (Squad -> Pod rename). Frontend replaces
hardcoded teams with live data: PodCard (member chips add/remove, inline edit,
delete, join) + CreatePodForm; App fetches+mutates via API. Removes teams.ts/
TeamCard; gitignores test artifacts.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

shared/src/index.ts

@@ -1,4 +1,4 @@
-export type { Pod, Engineer } from './pod.js';
+export type { Pod, PodInput, Engineer } from './pod.js';
 export type { EngineerContext } from './engineer.js';
 export type { Collision, CollisionSeverity, GithubStateSnapshot } from './collision.js';
 export type {

shared/src/pod.ts

@@ -1,11 +1,26 @@
-/** A pod is one room of engineers working together (one LiveKit room per pod). */
+/**
+ * A pod is one room of engineers working together (one LiveKit room per pod).
+ * Persisted in MongoDB; CRUD'd via /api/pods.
+ */
 export interface Pod {
+  /** URL-safe slug, e.g. "frontend-pod". Stable id used everywhere. */
   id: string;
   name: string;
   /** GitHub repo the pod is working in, as "owner/name". */
   repo: string;
-  members: Engineer[];
+  description?: string;
+  /** Engineer display names PodMan uses when it speaks. */
+  members: string[];
   createdAt: string;
+  updatedAt: string;
+}
+
+/** Fields accepted when creating or updating a pod. */
+export interface PodInput {
+  name?: string;
+  repo?: string;
+  description?: string;
+  members?: string[];
 }
 
 export interface Engineer {