refactor(main): move IPC, CLI and app-ready wiring into assemblies (#311)

src/main/assemblies/slices.ts

@@ -0,0 +1,19 @@
+import type { RegisterIpcRuntimeServicesParams } from '../ipc-runtime';
+import type { CliCommandContextMainDeps } from '../runtime/cli-command-context-factory';
+
+/** Renderer IPC handlers, minus the two the IPC composer builds itself. */
+export type IpcHandlerDeps = Omit<
+  RegisterIpcRuntimeServicesParams['mainDeps'],
+  'handleMpvCommand' | 'runSubsyncManual'
+>;
+
+/**
+ * The IPC handlers one assembly provides. `Required` because most handlers are optional on
+ * the registration params, and a slice must not drop one silently.
+ */
+export type IpcSlice<K extends keyof IpcHandlerDeps> = Required<Pick<IpcHandlerDeps, K>>;
+
+/** The CLI command handlers one assembly provides. */
+export type CliSlice<K extends keyof CliCommandContextMainDeps> = Required<
+  Pick<CliCommandContextMainDeps, K>
+>;