J. Nick Koston 649aec69d7 [logger] Make tx_buffer_ compile-time sized ...

Replace the heap-allocated tx_buffer_ (new char[]) with a compile-time
sized inline array using ESPHOME_LOGGER_TX_BUFFER_SIZE define. This
eliminates a heap allocation during Logger construction, saving ~513
bytes of heap on memory-constrained devices like BK72xx.

Changes:
- Add ESPHOME_LOGGER_TX_BUFFER_SIZE define set from Python config
- Change tx_buffer_ from char* to char[ESPHOME_LOGGER_TX_BUFFER_SIZE+1]
- Remove tx_buffer_size_ member field
- Update constructor to no longer take tx_buffer_size parameter
- Update all references to use the compile-time constant

2026-02-22 12:56:28 -06:00

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