fix: detect quoted Windows runtime processes and prefer LocalAgent CLI

[Taor233]

Problem

• On Windows, Get-CimInstance returns quoted command lines such as "...browser-runtime-service.mjs" ..., so the runtime-process regex missed the running service and tabbit_browser_install reported restart-required even when the Runtime was ready.
• The Browser-owned user launcher on Windows lives at %LOCALAPPDATA%\Tabbit\LocalAgent\bin\tabbit-cli.exe, but discovery could prefer a bundled tabbit-playwright-cli.exe helper, and the skill instructed models to invoke ~/.local/bin/tabbit-cli, which does not exist in that layout.

Changes

• installer.js: accept quotes around runtime-process paths; check %LOCALAPPDATA%\Tabbit\LocalAgent\bin\tabbit-cli.{exe,cmd} before ~/.local/bin and bundled helpers.
• index.js: include cliPath in tabbit_browser_install results for ready, restart-required, and background.
• Skill docs: prefer the reported cliPath; document platform defaults for Windows PowerShell, Windows Git Bash, and macOS/Linux.
• Tests: quoted Windows process command lines, LocalAgent preference, and the cliPath output field.

Testing

• New and updated tests pass (npm test).
• Four pre-existing tests still fail only on Windows because they assert POSIX path separators; the identical failures reproduce on clean main, so they are out of scope here.
• npm pack --dry-run is clean.
• Live check on Windows 11: detectTabbit() now returns ready with cliPath pointing at the LocalAgent launcher, and a nodejs smoke task opened example.com and returned the title.