feat(team-mode): add team session registry with tests

src/features/team-mode/team-session-registry.ts

@@ -0,0 +1,33 @@
+export type TeamSessionRole = "lead" | "member"
+
+export type TeamSessionEntry = {
+  teamRunId: string
+  memberName: string
+  role: TeamSessionRole
+}
+
+const registry = new Map<string, TeamSessionEntry>()
+
+export function registerTeamSession(sessionId: string, entry: TeamSessionEntry): void {
+  registry.set(sessionId, entry)
+}
+
+export function lookupTeamSession(sessionId: string): TeamSessionEntry | undefined {
+  return registry.get(sessionId)
+}
+
+export function unregisterTeamSession(sessionId: string): void {
+  registry.delete(sessionId)
+}
+
+export function unregisterTeamSessionsByTeam(teamRunId: string): void {
+  for (const [sessionId, entry] of registry.entries()) {
+    if (entry.teamRunId === teamRunId) {
+      registry.delete(sessionId)
+    }
+  }
+}
+
+export function clearTeamSessionRegistry(): void {
+  registry.clear()
+}