* feat(linux): add node device capabilities
* fix(linux-node): actionable pending-approval error + node-host advertise integration test
* fix(linux-node): map geoclue access-denied to LOCATION_DISABLED; floor camera maxWidth to avoid zero-height scale
* fix(linux-node): clamp small camera maxWidth to 2 instead of default
* docs(linux-node): clarify where-am-i -t is a process timeout, not update throttle
* refactor(gateway): extract legacy-node filter + rejection hint to fit LOC ratchet; docs-map + deadcode baseline
* fix(gateway): drop now-unused DEFAULT_DANGEROUS_NODE_COMMANDS import after hint extraction
* test(node-host): drop imports orphaned by removed error-code test
