Add meetings, sprints, and approval decision notes

Migration 042 creates meetings and sprints tables, adds decision_notes
to approvals. Full-stack: MeetingService, SprintService, IPC channels,
preload bridge, domain types. UI: MeetingsPage with scheduling and
type filtering, SprintsPage with progress tracking, ApprovalDetailDialog
with decision notes textarea.

AgentCompany-New/src/shared/ipc.ts

@@ -70,6 +70,10 @@ export const IPC_CHANNELS = {
   createAutomationRule: "agentcompany:create-automation-rule",
   updateAutomationRule: "agentcompany:update-automation-rule",
   deleteAutomationRule: "agentcompany:delete-automation-rule",
+  createMeeting: "agentcompany:create-meeting",
+  deleteMeeting: "agentcompany:delete-meeting",
+  createSprint: "agentcompany:create-sprint",
+  deleteSprint: "agentcompany:delete-sprint",
   search: "agentcompany:search",
   rendererEvent: "agentcompany:renderer-event",
   windowMinimize: "agentcompany:window-minimize",