refactor(contracts): compose DesktopApi from per-domain sub-interfaces

Split the flat 134-method DesktopApi interface into 12 domain
sub-interfaces (companies, agents, tasks, runs, approvals,
communication, threads, credentials, skills, budget, automation,
window) under src/shared/contracts/desktop-api/. desktop-api.ts
now intersects them to preserve the exact external flat shape;
window.agentCompany consumers and preload wiring are untouched.

src/shared/contracts/desktop-api/runs.ts

@@ -0,0 +1,17 @@
+import type { z } from "zod";
+import type { RunLogChunk, RunRecord } from "../../types";
+import type { cancelRunSchema, runLogChunkSchema, runLogSchema, startRunSchema } from "../schemas-execution";
+import type { entityGetterSchema } from "../schemas-badges";
+import type { DesktopResult, RunEventRecord } from "./common";
+
+export type RunsApi = {
+  startTaskRun: (input: z.infer<typeof startRunSchema>) => Promise<DesktopResult<string>>;
+  cancelRun: (input: z.infer<typeof cancelRunSchema>) => Promise<DesktopResult<boolean>>;
+  getRunLog: (input: z.infer<typeof runLogSchema>) => Promise<DesktopResult<string>>;
+  getRunLogChunk: (input: z.infer<typeof runLogChunkSchema>) => Promise<DesktopResult<RunLogChunk>>;
+  getRun: (input: z.infer<typeof entityGetterSchema>) => Promise<DesktopResult<RunRecord>>;
+  listRunEvents: (companyId: string, runId: string, opts?: { offset?: number; limit?: number }) => Promise<DesktopResult<RunEventRecord[]>>;
+  recoveryRetry: (taskId: string, agentId: string, companyId: string) => Promise<DesktopResult<null>>;
+  recoveryDismiss: (taskId: string) => Promise<DesktopResult<null>>;
+  recoveryFail: (taskId: string) => Promise<DesktopResult<null>>;
+};