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>

CLAUDE.md

@@ -0,0 +1,26 @@
+# Project: tiletopia
+
+A Windows desktop app for running and arranging many WSL terminals at once. Built primarily to manage multiple `claude` sessions across projects in parallel; works for any multi-shell workflow.
+
+## Working agreement
+
+- This is a git repo with `origin` on Forgejo at `https://git.rdx4.com/megaproxy/tiletopia.git` (private). HTTPS auth uses the token in `~/.git-credentials` — pushes are non-interactive.
+- Commit after each logical change with a one-line imperative message; `git push` after each commit (or at minimum before ending the session).
+- Read `memory.md` at session start. Update it before ending the session.
+- Never commit secrets — see `.gitignore` and the rules in `~/claude/CLAUDE.md`.
+
+## Project-specific notes
+
+- **Stack:** Tauri 2 + Svelte 5 + TypeScript + Vite + pnpm + xterm.js + `portable-pty`. Mirrors `~/claude/projects/claude-usage-widget/` for toolchain choices.
+- **Build target:** Windows `.exe` only. Rust toolchain lives on the Windows host, not WSL.
+- **Source location:** `D:\dev\tiletopia\` (Windows-native NTFS). Symlinked into WSL at `~/claude/projects/tiletopia` for editing convenience, but **all pnpm and cargo commands must run on the Windows host** against the `D:\` path — never the `\\wsl.localhost\...` UNC path (pnpm 11.x crashes inside `isDriveExFat`, and the underlying error gets swallowed).
+- **Run:**
+  ```powershell
+  cd D:\dev\tiletopia
+  pnpm install
+  pnpm tauri dev          # iterate
+  pnpm tauri build        # NSIS installer at src-tauri\target\release\bundle\nsis\
+  ```
+- **Validate in WSL:** `pnpm check` (svelte-check) runs in WSL and validates the Svelte/TS side without needing the Rust toolchain.
+- **Plan reference:** `~/.claude/plans/imperative-coalescing-feigenbaum.md` — the approved plan that drove the scaffold and the full M0–M5 milestone roadmap.
+- **Archived idea history:** the brainstorm phase + full session log lives at `~/claude/archive/ideas/wsl-mux/plan.md`.