docs: the Windows node's three modes and one lifecycle, and what it costHEADmain

- MESHBAY_DESIGN.md §11.2: the node runs only while the app is open, at
  sign-in, or as a boot-time service; starting and stopping have one
  implementation, the CLI's; a second instance refuses before it writes
  anything the running one depends on.
- packaging/win/README.md: the three modes, switching between them, upgrading
  a running node, where the log is, the service task's settings.
- docs/windows-build.md: the build's smoke start of the frozen daemon, the log
  location, and what an upgrade does to a running node.
- CLAUDE.md: four engineering lessons -- an upgrade that cannot stop the node
  installs around it; on Windows the CLI is the process it is stopping; a
  second instance must fail before it touches anything shared; a test that
  redirects HOME isolates nothing on Windows.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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