claude extension lifecycle
make test-integration failed at widget-tree finalization: the
palette's dispose() clears its scope flag, which during app teardown
runs AFTER KernelServices.dispose() has disposed the KeymapService —
notifyListeners asserted. Scope-flag mutations now use the same
fire-and-forget guard SettingsStore established. Same family in
ClaudeConfig: activation's unawaited load() could notify (and start
watchers on) a disposed notifier when a teardown raced it.
The claude extension's activation lifecycle and command success paths
are now exercised end-to-end through the kernel fixture — the file
entered the coverage denominator with the T-391 failure-path tests,
so per the ratchet discipline the rest of it gets covered too.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>