Initial scaffold from M1 spike (tiletopia)

Tauri 2 + Svelte 5 + xterm.js + portable-pty. Single full-window
WSL terminal pane with clickable distro picker. M1 verified manually
on Windows: window opens, xterm.js renders, claude TUI works,
resize reflows cleanly.

Graduated from ~/claude/ideas/wsl-mux/ per the approved plan at
~/.claude/plans/imperative-coalescing-feigenbaum.md. See memory.md
for decisions, open TODOs, and the M2-M5 roadmap.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ipc.ts

@@ -0,0 +1,32 @@
+import { invoke } from "@tauri-apps/api/core";
+import { listen, type UnlistenFn } from "@tauri-apps/api/event";
+
+export type PaneId = number;
+
+export const listDistros = (): Promise<string[]> => invoke("list_distros");
+
+export const spawnPane = (args: {
+  distro?: string;
+  cwd?: string;
+  cols: number;
+  rows: number;
+}): Promise<PaneId> => invoke("spawn_pane", args);
+
+export const writeToPane = (id: PaneId, dataB64: string): Promise<void> =>
+  invoke("write_to_pane", { id, dataB64 });
+
+export const resizePane = (id: PaneId, cols: number, rows: number): Promise<void> =>
+  invoke("resize_pane", { id, cols, rows });
+
+export const killPane = (id: PaneId): Promise<void> => invoke("kill_pane", { id });
+
+export const onPaneData = (
+  id: PaneId,
+  cb: (b64: string) => void,
+): Promise<UnlistenFn> =>
+  listen<{ b64: string }>(`pane://${id}/data`, (e) => cb(e.payload.b64));
+
+export const onPaneExit = (
+  id: PaneId,
+  cb: () => void,
+): Promise<UnlistenFn> => listen(`pane://${id}/exit`, () => cb());