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support (#3853)
Promote SEGGER RTT from an inline debugging technique to a standalone skill
backed by one stdlib-only implementation in tools/rtt.py: a CLI and importable
module for console/capture over J-Link (RTTTelnetPort) and OpenOCD (rtt server)
probes, with probe selection by serial or VID:PID, control-block address via
--elf or --addr, bidirectional console, post-mortem ring dump, and
--reset-before-attach for boot-time capture. The HIL harness reads a board's
console over RTT when its probe has no VCOM ("logger": "rtt" plus a LOGGER=rtt
variant define), covering device_info, pool-check aliveness, and CI wiring.
Validated on 22 boards across both backends; 26 unit tests run in pre-commit.
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