fix(packaging): three MSIX first-run regressions found by a real sideload

A second-machine sideload of the MSIX target surfaced three things the
earlier verification round (which only proved the package installs and
runs) had missed:

1. meshbay-node missing from PATH. installer.nsh's customInstall adds
   node-runtime\ to HKCU\Environment at install time -- an unelevated
   per-user write, never blocked by MSIX's no-elevation rule, only by the
   more basic fact that an AppX/MSIX install runs no custom code at all.
   packaging/win/ensure-node-path.ps1 (idempotent, no admin verb) plus
   main.js's winEnsureNodeOnPath() do it from the app itself instead, once
   per launch, shipped to Full and MSIX (not Light, nothing to add there).
   Verified live via the Node inspector protocol: the entry was in
   HKCU\Environment\Path after a launch, absent before.

2. A daemon that crashes on startup failed silently. spawnNodeDetached()
   used stdio: 'ignore', so a real crash reproduced live (a second instance
   colliding with the first on 127.0.0.1:18000) left waitForNode()'s
   generic 60s timeout as the only failure ever shown. spawnNodeDetachedWatched()
   pipes stdio and watches ~2.5s, rejecting immediately with the daemon's
   own stderr on an early exit; a survivor has its streams released and
   runs fully detached exactly as before. First version bounded the
   captured text by line count and a live test showed that cut the actual
   OSError line -- two uvicorn/asyncio tracebacks followed it in the real
   capture -- so it is bounded by characters instead.

3. No hint that a startup-mode choice exists. The install-time radio page
   was the only place this was ever offered, and nothing replaces it now
   that no install-time page can exist at all. SetupWelcome (the existing
   first-run banner) grew a conditional hint, shown only while a bundled
   node is present and neither autostart nor service mode is configured
   yet. Considered and rejected: linking straight to the Node page -- its
   route is gated on a linked hub node key, false on the exact fresh-install
   screen this hint targets, so the link would have been dead on arrival.
   New key setup.node_startup_hint, added to all ten locale catalogues.

test_packaging_win.py gained six tests pinning all three (69 total).
Full plan and verification detail: C:\Users\admin\devel\msix-installer.md
section 13 (out of repo).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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