* fix(providers): launch plugin CLIs on Windows and tolerate Muse startup
Plugin providers bypassed the core Windows launcher and the plugin host exposed an empty server SDK module. Share the launcher through the SDK and bind it in the host. Give Muse initialization its own deadline because native startup traverses session history before answering MSP.
* fix(providers): terminate Windows launcher process trees
A command-script launcher leaves the CLI behind cmd.exe. Expose forced process-tree termination in the server SDK, use it for Muse and SDK ACP teardown, and bound Muse closing so inherited streams cannot leave callers waiting forever.
* test(muse): keep platform setup outside the teardown assertion
* refactor(plugin): expose process capabilities without quoting helpers
* fix(providers): close process trees on uncorrelated protocol errors
* feat(plugins): unify source installation and simplify plugin settings
* feat(plugins): install npm sources and review CLI updates
Treat install selectors as one-time choices. Keep source identity separate from the installed revision, and resolve ordinary updates from the current upstream default. npm only acquires directories; plugin loading remains independent of npm.
* fix(plugins): preserve CLI diagnostics and exercise reviewed updates
Move new source capability coverage to real browser journeys. Update the requirements regression to exercise preview and apply, and preserve the existing duplicate-selector diagnostic across positional option scopes.
* test(plugins): remove unused pending helper
* test(plugins): pack registry fixtures with the Windows command runner
* test(plugins): assert failed client contribution setup
* docs(plugins): consolidate guides and document npm publishing
* docs(plugins): introduce publishing choices before npm instructions
* test(plugins): own browser journey cleanup in a fixture
* feat(plugins): prepare scaffolded packages for publishing
Mohamed Boudra