Dev build 20 (tauri-rewrite)

Automated build of 8947d1a78a317ff256f73fe75f9b937bae56bac5 on tauri-rewrite.

• Windows: *-setup.exe (NSIS)

Phase 1 shell: the original VS Code workbench renderer served
natively through the Tauri v2 vscode-file:// custom protocol
(WebView2). No Electron, no HTTP server, no vscode-web. The
renderer boots against a native window configuration and an
instrumented IPC bridge (ipc-calls.jsonl + vstauri.log in
%APPDATA%\VSTauri\logs) that feeds the next phases.

NOTE: Phase 1 scope is "workbench renders". Terminal, file
dialogs, storage and extensions land in later phases (see
ROADMAP.md); their IPC channels currently resolve to null and
are logged.