chore(master): release 1.6.0

[tm-infra-robot]

🤖 I have created a release beep boop

1.6.0 (2025-12-06)

Features

• add bit-level access for boolean registers (cecf79d)
• add new argument 'serial' to support multiple framers, including rtu/ascii/binary. Keep the old 'rtu' argument as an alias to 'serial' argument for backward compatibility. (d42ab78)
• add support for ascii framer (#97) (c918e74)

Bug Fixes

• bit syntax is only used with bool dtype (cf1e2b9)
• forward mqtt tls flags to handler (#93) (d31db25)
• guard mqtt cleanup on setup errors (#95) (daa8c0c)

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[gavinying]

duplicated with #98