feat: add TX writeStream with loopback buffer for TX→RX testing#3

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zsoerenm wants to merge 3 commits intoJuliaTelecom:mainfrom

zsoerenm:ss/add-tx-loopback

Commits on Jan 5, 2026

feat: add TX writeStream with loopback buffer for TX→RX testing

zsoerenm
and
claude
committed
fix: skip _buf_count decrement in loopback mode in releaseReadBuffer

zsoerenm
and
claude
committed
feat: support all sample formats in TX loopback (CS8, CS12, CS16, CF32)

zsoerenm
and
claude
committed