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J. Nick Koston
752f36458b
Track driver installation with a dedicated flag. Component state was the wrong predicate on both ends: before setup uart_num_ is not yet assigned so uart_is_driver_installed() could alias another bus, and after a runtime failure the installed driver kept working, so gating on is_ready() turned mark_failed() into a permanent bus shutdown that load_settings() could not revive. Also throttle the dropped write warning to a single line since consumers writing from loop() can hit it on every iteration of the setup phase wait loops.
