refactor(contracts): split schemas-misc into per-domain files

Break the 281-line kitchen-sink schemas-misc.ts into 12 domain modules
(badges, automation, budget, wakeup, config-revisions, run-events,
agent-permissions, heartbeat, runtime-state, threads, participants,
subscriptions). schemas-misc.ts now re-exports the domain barrel so
existing imports keep working. Adds direct exports to contracts.ts for
new code to pull from the narrower modules.

src/shared/contracts/schemas-threads.ts

@@ -0,0 +1,58 @@
+import { z } from "zod";
+
+export const createThreadSchema = z.object({
+  companyId: z.string().uuid(),
+  title: z.string().min(1).max(200),
+  type: z.enum(["task", "approval", "general", "announcement"]),
+  relatedEntityType: z.string().nullable().optional(),
+  relatedEntityId: z.string().nullable().optional(),
+});
+
+export const listThreadsSchema = z.object({
+  companyId: z.string().uuid(),
+  type: z.enum(["task", "approval", "general", "announcement"]).optional(),
+  relatedEntityType: z.string().optional(),
+  relatedEntityId: z.string().optional(),
+  limit: z.number().int().min(1).max(100).default(50),
+  offset: z.number().int().min(0).default(0),
+});
+
+export const threadGetterSchema = z.object({
+  companyId: z.string().uuid(),
+  threadId: z.string().uuid(),
+});
+
+export const addThreadEventSchema = z.object({
+  companyId: z.string().uuid(),
+  threadId: z.string().uuid(),
+  actorId: z.string().min(1),
+  actorType: z.enum(["agent", "user", "system"]),
+  eventType: z.enum(["message", "status_change", "approval_request", "approval_decision", "file_attachment", "system_note"]),
+  body: z.string().default(""),
+  metadataJson: z.string().default("{}"),
+});
+
+export const listThreadEventsSchema = z.object({
+  companyId: z.string().uuid(),
+  threadId: z.string().uuid(),
+  limit: z.number().int().min(1).max(100).default(50),
+  offset: z.number().int().min(0).default(0),
+});
+
+export const setThreadWaitStateSchema = z.object({
+  companyId: z.string().uuid(),
+  threadId: z.string().uuid(),
+  waitingFor: z.enum(["user_review", "user_approval", "user_reply"]),
+  relatedApprovalId: z.string().nullable().optional(),
+  reason: z.string().min(1).max(500),
+});
+
+export const resolveThreadWaitStateSchema = z.object({
+  companyId: z.string().uuid(),
+  waitStateId: z.string().uuid(),
+});
+
+export const listThreadWaitStatesSchema = z.object({
+  companyId: z.string().uuid(),
+  resolvedOnly: z.boolean().default(false),
+});